Fixing Denmark eSIM No Service Issue 丨 Manual Network Selection, Reboots

In Denmark, seeing “No Service” with an eSIM is usually related to network configuration or signal switching. It is recommended to first go to phone settings and manually select a carrier (such as TDC, Telia, or 3 Denmark), which can increase the success rate by about 60%.

Secondly, restarting the device or toggling Airplane Mode on and off can refresh the base station connection, typically restoring the signal within about 30 seconds. If there is still no service, check if the APN parameters are automatically loaded or update the carrier profile. In most cases, these three steps can solve the problem within 5 minutes, making them simple and efficient.

Airplane Mode & Reboot Trick

If the Denmark eSIM is installed but the status bar still shows No Service, SOS, or Searching, start with Airplane Mode and a reboot. official iPhone guidelines require Airplane Mode to be on for at least 15 seconds; the official Android troubleshooting page specifies 10 seconds; Pixel even suggests completely powering off for 30 seconds before turning it back on. On dual-SIM devices, usually only 1 line is responsible for cellular data at a time. After getting off a plane, switching data lines, or switching from Wi-Fi back to mobile network, reconnect the network once before proceeding to manual network selection and APN checks.

Don’t Delete the eSIM Right Away

Many people’s first reaction when seeing No Service, SOS, or Searching on their Denmark eSIM is to delete and reinstall it. This often makes troubleshooting more complex. In Apple’s support documents for “Unable to Set Up eSIM” and “No Service,” the steps listed first are toggling Airplane Mode, turning the line off and back on, and restarting the device to see if a carrier appears in the status bar—not deleting the eSIM. iPhone’s Airplane Mode is recommended to stay on for 15 seconds, and Pixel’s mobile connection troubleshooting includes powering off for 30 seconds before restarting.

Deleting an eSIM and “turning off this line” are not the same thing. Apple lists “Delete eSIM / Delete Plan” specifically for removing the eSIM profile stored on the phone; in “No Service” troubleshooting, it says to go to Cellular to see if the line is on, and if not, tap Turn On This Line. In other words, many “no connection” issues are just due to line status, network registration, default data line settings, roaming, or APN mismatches—not necessarily a broken eSIM profile.

Completing these steps first is usually easier:

• For iPhone, turn on Airplane Mode for 15 seconds, then turn it off and check if a carrier name appears in the status bar.

• If the number is already visible in Cellular, turn the line off and then back on, then check the status bar again.

• For Pixel/Android, check SIMs and Mobile network under Network & internet, then restart; Pixel official guides also mention powering off for 30 seconds.

• For dual-SIM iPhones, confirm the default cellular data is set to the travel eSIM; Apple specifies that only 1 cellular data line is used at a time.

• Resetting network settings should also come before deletion. iPhone’s Reset Network Settings clears saved Wi-Fi, VPNs, APNs, and preferred networks, and cellular roaming might be turned off, but Apple lists “Delete All eSIMs” as a separate option.

If you delete it right away, you’ll have more steps to complete later. Apple states clearly: after deleting an eSIM, you must set up a new eSIM or insert a physical SIM to reconnect to cellular service; if you delete the eSIM while erasing the device, you’ll need to contact the carrier to reactivate the plan. In travel scenarios, this often means needing to get a new QR code, using a carrier app, or going through the activation process again.

This is why deleting the eSIM shouldn’t be the first step. It isn’t a “network refresh”; it removes the plan profile already downloaded to the phone. Apple’s setup documents mention that eSIM activation methods can be QR codes, Carrier Activation, or Quick Transfer, depending on carrier support; Samsung’s eSIM documents also state that for many models, re-adding an eSIM requires going through Settings > Connections > SIM manager > Add eSIM again.

You can think of “Delete” as a much more drastic step than “Reconnect.”

• Airplane Mode, toggling the line, and restarting change the current connection state.

• Reset Network Settings / Reset Mobile Network Settings change network parameters and saved configurations.

• Delete eSIM changes the eSIM profile itself on the phone. After deletion, the original plan won’t automatically return to the phone.

• During a Factory Reset, the system sometimes asks if you want to “Keep eSIMs” or “Delete eSIMs”; this also shows that deletion is treated as a separate action, not something that happens by default with every reset.

From a user perspective, these small details are more likely to cause issues than the eSIM itself: just landing in Denmark and switching from airport Wi-Fi to cellular; having both a primary number and a travel eSIM on a dual-SIM phone but the default data is still on the original number; Data Roaming being turned off after a Network Reset; or the APN being cleared. Apple mentions in its reset instructions that cellular roaming might be turned off; Samsung also places Reset network settings in its handling for “no signal, dropped calls, or mobile network issues.”

Following this checklist is often enough:

• Check if the line is on: For iPhone, check Turn On This Line; for Samsung, check SIM manager; for Pixel, check SIMs.

• Ensure the correct default data line is selected: Dual-SIM iPhones only use 1 line for cellular data.

• Check if Roaming is on: Apple notes that cellular roaming may be turned off after a network reset.

• Check if the APN was cleared: Apple includes APNs in items cleared during a network reset.

• Check current location coverage: Google’s Android troubleshooting page reminds you to move to a different location if there’s no signal indicator.

There is also a very practical sequence that won’t cause confusion: start with Airplane Mode for 15 seconds, then a reboot, then toggle the line off and on, then check the default data line, and finally a network reset. Only after all these are done—and there is still no carrier name, no 4G/5G, and no local network registration—should you consider deleting and reinstalling the eSIM.

Follow This Order

If your Denmark eSIM is installed but the status bar still shows No Service, SOS, or Searching, don’t change the APN, delete the eSIM, and reset the network all at once. Apple’s troubleshooting for No Service and eSIM setup suggests testing one by one: first check if the line is on, then Airplane Mode, then reboot, then check carrier info and roaming; Google suggests powering off for 30 seconds for Pixels; Samsung places forced restarts and network resets later in the process.

Checking the line status first is key because many “no connection” issues aren’t due to plan expiration, but the line being off, the wrong data line being selected, or data still being tied to the home line when both are active. Apple makes it clear: dual-SIM iPhones only use 1 cellular data network at a time. If you’ve installed the travel eSIM but Cellular Data is still on your home line, it will look like “eSIM is there, network is not.”

I suggest following this specific order for these settings:

• iPhone: Settings > Cellular, check if Turn On This Line is enabled.

• Dual-SIM iPhone: Settings > Cellular > Cellular Data, confirm the travel eSIM is selected.

• Android / Pixel: Settings > Network & internet, check SIM and Mobile data. For Samsung, check the Mobile data toggle in the dropdown menu first.

• If the status bar still shows Searching, move to the next step; don’t do APN and Network Reset at the same time. An incorrect APN will disconnect data, and Apple warns “don’t change APN settings unless instructed.”

Airplane Mode is listed early because it refreshes the connection without touching the plan data. iPhone’s No Service page suggests at least 15 seconds; another eSIM troubleshooting page puts “Turn Airplane Mode on and off” as step 1, followed by toggling the line and rebooting.

When doing this, look for more than just signal bars.

• Sometimes signal bars return without 4G / LTE / 5G; that usually requires checking Cellular Data.

• In travel scenarios, if Data Roaming is off, data won’t start. Apple’s international travel troubleshooting lists roaming as a separate setting.

• If you just disconnected from airport or hotel Wi-Fi, turn off Wi-Fi temporarily to see if cellular has recovered. Apple’s cellular settings page notes that when Cellular Data is off, mail, web, and notifications use Wi-Fi.

Rebooting should follow Airplane Mode. Apple’s eSIM troubleshooting places Restart at step 3; Pixel’s mobile connection troubleshooting is more specific, requiring Power off, waiting 30 seconds, then turning it back on (not using restart). Samsung also suggests a force restart, noting data and files remain safe. For users, this takes 30 seconds to 1 minute but won’t affect the eSIM itself.

If things still haven’t recovered, look at the carrier and location. Apple suggests confirming 3 things before contacting a carrier: the account is active, the area has coverage, and there’s no local outage; it also mentions checking for carrier settings updates in Settings > General > About. In other words, phone settings might be fine, but there’s simply no service in the area or a carrier issue.

You can organize this check like this:

• Move outdoors, near a window, or to the street and try again. Underground garages, subways, and thick-walled buildings often cause false results.

• On iPhone, go to General > About to see if a Carrier update prompt appears next to the eSIM.

• Note any error messages, your IMEI or EID, number, and carrier PIN; Apple advises having these ready before calling.

• For Samsung, if all above fail, go to Settings > General management > Reset > Reset network settings.

Network reset should be one of the last steps because it clears saved network parameters. Apple notes it clears Wi-Fi passwords, preferred networks, VPNs, and APNs; Samsung states it resets Wi-Fi, Bluetooth, and other network settings; Pixel also places Reset mobile network settings as a later step. If you reset too early, you’ll have to re-enter all that info, making troubleshooting longer.

Following this order, the first 4 steps usually take about 3 minutes: enabling the line, Airplane Mode for 15 seconds, rebooting or powering off for 30 seconds, and checking data/roaming; only then move to carrier updates, moving locations, and network resets.

When to Investigate Further

After Airplane Mode, rebooting, and confirming the line is on, the status bar and settings page will provide many clues. Apple’s No Service troubleshooting starts with Airplane Mode for at least 15 seconds, rebooting, and checking the line status; Pixel’s troubleshooting adds Power off for 30 seconds and resetting the mobile network; Samsung also places network resets after basic steps. If these are done with no change, it’s time to dig deeper instead of repeating the same actions.

The table below can help you determine which situation fits best to decide your next step, based on public support guides from Apple, Google, and Samsung.

If the status bar still shows No Service / Searching / SOS after the basics and you’ve left airports/subways for 1–3 minutes outdoors, stop at Airplane Mode. Apple’s No Service guide requires checking if the account is active, checking coverage, and checking for local outages; Google suggests testing different locations to avoid misidentifying coverage issues as device issues.

If signal bars return but no 4G, LTE, 5G, or H indicators appear, or the carrier shows but web pages won’t load, it’s a “line is active, data is not” scenario. Apple’s settings note that if Cellular Data is off, data will go through Wi-Fi; Google recommends using the top data icon to confirm connection. In these cases, checking Cellular Data / Mobile data, default data line, roaming, and APN is more useful than another reboot.

Dual-SIM users are most likely to hit “eSIM present, no data.” Apple’s Dual SIM info is clear: only 1 cellular data network is used at once. If the home line and travel eSIM are both on but Cellular Data is set to home, the travel eSIM won’t connect data. International travel pages also remind you to ensure Turn On This Line is active for the right line and to turn off unused travel eSIMs when finished.

Another case for deeper investigation: if a reboot briefly fixes things but it drops back to SOS/No Service after a few minutes. Pixel’s support site classifies this as a deeper mobile connection issue, suggesting Power off 30 seconds and Reset mobile network settings; Samsung similarly lists network resets for unstable connections. For recurring drops, stop repeating Airplane Mode and start checking network settings, updates, and carrier status.

Network reset isn’t step one, but for some symptoms, it becomes necessary. Apple notes Reset Network Settings clears Wi-Fi, cellular settings, VPNs, and APNs; Google Pixel guides place Reset mobile network settings after powering off and on; Samsung lists it for mobile data anomalies. Once you’ve ruled out coverage, disabled lines, or Airplane Mode refresh issues, proceed here—but write down your Wi-Fi passwords, APNs, and VPNs first.

Note this info now to save time later whether troubleshooting further or calling the carrier:

• Is it No Service, Searching, SOS, or just no data?

• Steps already taken, like 15s Airplane Mode, reboot, 30s power off, or network reset.

• Location: outdoors, indoors, subway, station, or just left hotel Wi-Fi.

• Which line is the default data line?

• Are Cellular Data / Mobile data and Data Roaming on?

• The phone’s IMEI, EID, carrier name, and plan name.
  This info aligns with what Apple’s eSIM and No Service pages ask users to prepare.

Use this as your guide: if the problem is line status, data line selection, roaming/APN toggles, or location coverage, keep checking settings; only once those are exhausted and the device won’t register should you prioritize “delete eSIM, reinstall eSIM, or contact carrier for reactivation.”

Manual Network Selection

If the Denmark eSIM is on but shows No Service, Emergency Calls Only, or 0 bars, go to Settings > Cellular/Mobile Data > your eSIM > Network Selection, turn off Automatic, wait 15–60 seconds for the phone to scan, and manually try TDC NET, Telia, Telenor, or 3; wait 30–90 seconds after each selection until LTE/4G/5G and the carrier name appear before testing the internet.

Determine the Problem First

When seeing No Service, Emergency Calls Only, or empty signal bars, don’t rush to delete the eSIM or rescan the QR code. First, determine the layer of the problem: is the eSIM not enabled, is the phone not registering to the Danish network, is it registered but data isn’t starting, or are dual-SIM settings directing data to the wrong line?

Check if the eSIM is “alive.” Go to Settings > Cellular / Mobile Data and find your Denmark eSIM. Check 4 things: is the switch On, is it the default data line, is Data Roaming on, and does the card have its own network settings page? If the line name shows normally and the switch toggles, the system recognizes the eSIM; if the switch is grayed out, the page won’t open, or you see SIM Failure / Invalid SIM, the issue is likely not at the network selection layer.

“Installed” and “connected to internet” are not the same thing.
An eSIM appearing in the system just means the profile is written, not that network registration is complete.

Next, look at the status bar. Different “no connection” signals mean different things:

If you’ve just landed, powered on, or switched from Wi-Fi to cellular, short-term instability is normal.
The best approach: let the phone sit for 60 seconds; don’t change settings while moving, and don’t toggle Airplane Mode more than 2 times within 20 seconds. The phone needs time to scan, attach, and establish a data session; the most common user error isn’t misjudgment, but not waiting long enough.

Then, check the default data line. This is easily missed on dual-SIM devices. Many have the Denmark eSIM on and roaming active, but default data is still on their home SIM. This leads to a confusing state where the eSIM looks fine and shows a carrier name, but the web is offline. Enter default data settings, confirm it points to the travel eSIM, and if not, switch it and observe for 30–60 seconds.

The following phenomena are mostly related to “line allocation” rather than a broken eSIM:

• eSIM is On, but default data is still on the other SIM

• Two sets of signals appear in the status bar, but the App still shows offline

• The voice line and data line are not on the same card

• Primary card roaming is off, but the system still tries to route data through it

• After switching default data, the status bar begins to change within 30 seconds

In dual-SIM phones, “which card is online” and “which card is responsible for traffic” are two different things.
Just because a user sees the icons recover doesn’t mean data is moving on the correct line.

After checking line allocation, look at Data Roaming.

Many overseas eSIMs rely on roaming to access local carriers. The line itself might be on, but if roaming is off, it will result in No Service or signal without data. Don’t just confirm with “I remember turning it on,” but click in to take another look. Both iPhone and Android may reset certain switches to default values after switching SIMs, updating the system, or resetting network settings. There’s no need to rely on memory for a switch that takes 1 second to confirm.

If the eSIM is On, default data is correct, and Data Roaming is enabled, the next step is not to delete the card, but to distinguish between “network not registered” and “data not establishing.” From a user’s perspective, the difference is quite specific. When not registered, there is usually no carrier name, or it stays on “Searching” for a long time. When data isn’t establishing, common scenarios involve LTE / 4G / 5G appearing, but webpages spin for over 10 seconds, speed tests won’t start, and messaging apps show a loading spinner.

You can use 2 quick tests to distinguish:

1. Check if the status bar has a carrier name + 4G/5G

2. Open a standard webpage and observe if the first screen loads within 5–10 seconds

The results can generally be understood like this:

Don’t ignore your location when judging. Are you in an airport arrivals area, a train carriage, a subway platform, an underground parking lot, an inner hotel room, or outside the building? On the same phone with the same eSIM, registration results can be completely different in spots only 50–200 meters apart. Indoor metal structures, thick glass, underground levels, and moving carriages can make “seemingly broken card” issues more common. If your first assessment was made while moving, it’s best to move outdoors or near a window and wait 1–2 minutes before checking the status bar again.

The margin of error at transportation hubs is much larger than on ordinary streets.
Airports, platforms, underground levels, and ferry cabins have higher signal switching frequencies, making initial judgments prone to bias.

Another easily confused point is “plan issues” vs. “device issues.” Users cannot see all backend info on system pages, but can make a preliminary split through performance. Signs of plan or access permission issues:

• Multiple networks can be scanned, but each reports “failed to connect” within 5–15 seconds

• Manually switched through 3–4 local networks, none ever showed a carrier name

• Another phone uses a different eSIM in the same region normally, while this one never works

Signs of device setting issues:

• eSIM is visible, but default data is not selected correctly

• Data Roaming is off

• 5G/LTE icon appeared briefly

• Performance changes after switching network modes or restarting

• The same network is closer to success outdoors than indoors

You don’t need to be 100% accurate the first time; just rule out the “settings layer” first, and the subsequent steps will be much shorter. Settings checks usually take only 1–3 minutes, whereas deleting, reinstalling, or contacting support lengthens the path.

You can also check if the system gives “soft success” signals. For example, the status bar goes from completely blank to briefly appearing with 1 bar, from No Service to Searching, or from Searching to a carrier name but no data. Such changes indicate the device is not completely stuck, but is fluctuating between different stages. The most common mistake users make here is treating all “incomplete recovery” as “total failure.” In fact, as long as there are layered changes in status, it is better to try manual network selection, switching to LTE, or changing locations rather than immediately deleting the eSIM.

The following details can help you judge how close you are to success:

• From no signal to 1 bar: Indicates a more stable cell signal has been received

• Carrier name appears but no internet: Indicates registration has moved a step further than before

• LTE appears for 10–20 seconds and then disappears: Indicates an attempt to attach failed to hold

• Restarting results in 1 more candidate network than before: Location or network mode might be the main cause

• Webpage starts loading after switching default data: Indicates the traffic line is finally pointed correctly

Not all failures are equal.
Being able to see “half a step more than the last round” means you should adjust settings next, rather than tearing everything down and starting over.

Make “judging first” a practical reading order rather than a one-time checklist. First check if the eSIM is recognized by the system, then check the default data and roaming switches, then see if the status bar is No Service, Searching, or has 4G/5G but no data, and finally see if your location is suitable for testing. Following this order, it usually takes 2–4 minutes to categorize the problem: unrecognized, unregistered, registered but no data, or line allocation error.

How to select manually

Manual network selection isn’t as simple as “clicking a network name when you see it.” After you enter Settings > Cellular / Mobile Data > your eSIM > Network Selection, turn off Automatic first, and the phone will start scanning again. This process usually takes 15–60 seconds. It is also common for the list to take over 45 seconds to refresh near airport or subway exits, indoor low floors, or train platforms. Do not exit the page repeatedly during this time, and do not switch while moving.

If only 2–3 networks appear when the list first shows up, wait another 10–20 seconds.
Many phones only show partial results at first and will complete the list after a second scan.

Common results on the screen are more than just a list of carrier names. You will encounter several different states: some network names provide no feedback, some will spin for 20–40 seconds when clicked, some will pop up “unable to connect,” and some will briefly show signal bars before dropping back to No Service. Handling methods cannot be identical. Being able to scan a network only means the phone received a broadcast signal, not that your eSIM plan will definitely be able to complete registration on that network.

Setting a steady pace is more useful than clicking randomly. It is recommended to try in the following order:

• Turn off Automatic
• Wait 15–60 seconds for the list to stabilize
• Select the 1st local network
• Wait 30–90 seconds
• Wait 10–20 seconds after a failure
• Select the next network
• Do not try more than 4 networks in 1 minute

After selecting a network, the phone performs 3 tasks:
Scans the current cell, initiates registration with the network, and waits for the network to return results.
If any step gets stuck, the status bar will stay on Searching or No Service.

If you see names like TDC NET, Telia, Telenor, or 3 in Denmark, don’t judge who is “better” based on impression. Instead, try them in order, allowing full waiting time for each attempt. A safer approach is to try them one by one from the top of the list rather than jumping around.

The following table is suitable for inclusion in the main text, allowing users to follow along easily:

Screen Status	How long to wait	What to do next
List just appeared, few items	10–20 seconds	Wait for second scan
Spinning infinitely after selecting	30–90 seconds	Do not exit the page
“Unable to connect” pops up	10 seconds	Return to list and try next
1–2 bars appear but no data	30 seconds	Stay still, test webpage first
Carrier name + LTE/5G appears	20 seconds	Test webpage and maps

Many people immediately assume “this eSIM is unusable” after the 1st failure. A more common scenario is: the first network does not accept registration, the second network has a weak signal, and the third network is successful. What you really need to observe is not “how many times it failed,” but whether the manner of failure changes. For example, if the first network reports an error after 5 seconds, while the second network spins for 40 seconds, and the third network even showed an LTE icon briefly, it indicates the phone is gradually approaching a usable state.

If a network once briefly displayed 4G/LTE/5G, even if only for 10–15 seconds,
prioritize trying it again next time; the success rate is usually higher than networks with no response.

Also note that names seen on the manual selection page aren’t necessarily usable candidates. Some networks appear in the list even if your eSIM plan lacks roaming access rights, or if the registration failure rate is high at that specific time and location. You don’t need to judge backend rules; just filter out invalid items by results. A time-saving way is a simple three-way classification:

• Immediate failure: Errors pop up 5–10 seconds after clicking
• Failure after long attempt: Spins for 30–90 seconds before failing
• Partial success: Carrier name, signal bars, or LTE/5G appears

The third category has the highest priority because it shows the phone completed at least part of the registration process. From a user perspective, subsequent actions are more practical:

• Stay in place for 30 seconds first
• Test 1 webpage
• Test 1 messaging app
• If unstable, click back to this network to retry 1 time
• Do not immediately switch to a network with no response

The goal of manual selection is not to click every network in the list.
It is to find the “responsive” one and then continue troubleshooting around it.

The device itself also affects waiting times. iPhone and Android are similar in selection logic, but interface feedback differs. iPhones more commonly stay in a spinning state; some Android devices pop up windows faster, but the background is still attempting registration. In either case, a result within 30 seconds doesn’t mean it’s fast, and no result after 60 seconds doesn’t mean certain failure. A safer approach is to set a 90-second limit per attempt, then switch if exceeded.

The following details can help reduce invalid operations:

• Stand still when testing; do not click while walking.
• Turn off Wi-Fi for 1–2 minutes to observe cellular performance only.
• Keep the screen on to prevent the system from entering power-saving mode.
• Charge the device first if the battery is below 10%.
• For dual-SIM devices, prioritize changing the default data to this eSIM.

Dual-SIM users especially need to take an extra step.

If the physical SIM is still the default data, the phone might appear to be processing the eSIM during manual network selection, while the actual data session is still on the other line. This results in seeing “carrier name present, but webpages won’t load.” When troubleshooting, assign the default data to the Denmark eSIM first, then start manual selection. If it remains chaotic, you can temporarily disable the other line for 2–3 minutes, leaving only the eSIM for testing, and restore it once connected.

Failing to change the default data line before manual network selection
often leads to “the status bar looks recovered, but apps are still offline.”

If you have already selected a network that displays a carrier name, do not leave the settings page immediately. Perform 2 rounds of simple tests first, which are more reliable than looking at icons:

1. Open a standard webpage and observe if the first screen loads within 5–10 seconds.
2. Open a map or messaging app to see if content can be refreshed.

It is not considered complete if only the icon recovers without actual data traffic. There are two common “semi-recovered” states:

• Displaying 1–2 bars of signal + LTE, but the webpage keeps spinning.
• Carrier name is present, but apps prompt that they are offline.

If you encounter this state, do not switch networks immediately; wait for another 20–30 seconds. Some devices complete the voice layer attachment first, and the data session takes a bit longer to start. If there is still no data after waiting 30 seconds, it is more appropriate to return to the list and try the next one.

During manual selection, avoid two high-frequency errors. The first is switching too quickly: clicking 3 networks within 20 seconds means the phone’s previous request hasn’t ended before the next one starts, making the status even more chaotic. The second is turning on Airplane Mode as soon as a failure occurs. Airplane Mode interrupts the current registration, causing you to lose the small amount of valid feedback you just gained.

You can record candidate networks as a set of very short notes based on the results, which will make troubleshooting much faster:

• Network A: Failed within 10 seconds.
• Network B: Failed after 40 seconds.
• Network C: LTE appeared, but webpages won’t open.
• Network D: Success, stable for 2 minutes.

If every network in the list has been tried once and still no carrier name or LTE/5G appears, the next step should not be staring at this page. A more reasonable sequence is: move outdoors or near a window, stay for 1–2 minutes, and then return to Network Selection to scan again; or change 5G Auto to LTE/4G first, then manually select the same batch of networks. By this point, the problem is no longer just “which name to select,” but also whether the location and network mode give the phone a chance to complete registration.

Manual network selection itself does only one thing: it stops the phone from relying on automatic mode and instead has you specify a local network to try. What users truly need is not more terminology, but to try, wait, and observe feedback at a steady pace. Giving each network 30–90 seconds and the list 15–60 seconds of scan time, then filtering based on “complete failure, partial success, or stable connection,” usually saves more time than repeatedly deleting the eSIM and re-scanning the QR code.

Change Location and Restart

If manual network selection has been tried and the carrier is visible in the list, but the status bar remains at No Service, Emergency Calls Only, or briefly shows 4G/5G before dropping back to no signal, do not stay in the same spot clicking the same network repeatedly. A more practical approach is to expand the troubleshooting scope: change the testing location first, then the access mode, and finally use a full restart to re-initialize the baseband and network session.

Check the location first. If the place where you first turned on the phone in Denmark is an airport arrival level, subway platform, underground parking lot, deep inside a hotel lobby, an office with thick glass curtain walls, a train carriage, or a ferry cabin, network performance is naturally prone to instability. The phone must first scan, then attach, and then obtain a data session; if the signal jitters during any of these stages, the status bar might drop from 2 bars to 0. The difference between indoors and outdoors is sometimes very obvious. Moving 30–200 meters—from underground or inside a building to the outdoors, a window, a street corner, or an open square—and scanning again often results in a much higher success rate than retrying in the same spot.

The change in location doesn’t need to be massive, but the environment must change meaningfully. The following types of places are better suited for a second round of testing:

• The sidewalk outside a building, staying for 1–2 minutes.
• A position near a window, within 1 meter.
• A street corner or an open stretch of road, avoiding metal enclosures.
• Parking lot exits or station exits, not on underground levels.
• Testing after getting off a train once it has stopped, not inside a moving carriage.

Some users encounter issues at transportation nodes: signal is found at the airport after landing but drops after passing customs; no signal in the subway and it fails to recover after exiting the station; hotel Wi-Fi works but cellular never does. One thing must be distinguished here: the phone constantly re-selects cells while moving, especially in trains, subways, ferries, or airport shuttle buses where base station switching is high-density; a newly installed eSIM is more likely to get stuck during its first attachment. If this happens, stop first and let the phone sit for 60–90 seconds; do not change settings while walking.

If you have moved outdoors and manual network selection still fails repeatedly between different carriers, check the network mode. Many devices default to 5G Auto, which theoretically decides between 5G/LTE automatically, but in areas of initial roaming registration, weak coverage, or frequent frequency switching, it is common for the 5G icon to appear and then vanish. Changing the Voice & Data from 5G Auto to LTE/4G is not about “downgrading,” but about letting the phone complete registration on a more stable layer first.

You can change it in this order, staying for a while to observe after each step:

• Keep 5G Auto first and wait for 30–60 seconds.
• If registration is unsuccessful, switch to LTE/4G.
• Wait another 30–90 seconds after switching.
• After the carrier name and LTE appear in the status bar, test webpage loading.
• Run 2 consecutive speed tests or open 3 common websites to confirm it’s not a momentary recovery.

Here, do not just stare at “whether there are signal bars.” It is more useful to look at 4 details:

Observation Item	What you see	Closest to which type of problem
Carrier Name	Does not display at all	Not yet registered
Mode Icon	4G/5G flashes and disappears	Unstable registration or frequency switching failure
Data Performance	Webpage spins for over 10 seconds	Session not established or poor quality
Stability Time	Drops again in less than 1 minute after recovery	Inappropriate location or mode

If LTE remains stable but 5G drops as soon as it’s turned on, don’t rush to switch back. After walking around the city for 10–30 minutes and once the device has been online continuously for a while, switching back to 5G Auto will have a higher success rate. Conversely, if you repeatedly switch quickly between 5G and LTE at the beginning, the phone will constantly re-initiate attachment, interrupting a process that was almost successful. Give it at least 30 seconds after each switch; 90 seconds is more appropriate in weak signal locations.

Another often overlooked point is the Dual-SIM status. If your physical SIM or primary card is also on, the phone handles primary voice, default data, roaming policies, and eSIM registration simultaneously. Sometimes it’s not that the eSIM isn’t working, but that the phone is still prioritizing the other line. At this point, you can temporarily take two steps: set the default data to the eSIM; if it remains chaotic, turn off the other line for 2–3 minutes, keeping only the Denmark eSIM online, then test registration. Decide whether to turn the primary card back on after testing.

Under Dual-SIM, the following situations are more likely to be seen:

• eSIM is on, but default data is still on the primary card.
• The primary card has roaming disabled, and the system switches the default channel back and forth.
• The status bar shows two sets of signals, but cellular data is unavailable.
• The call line and data line are inconsistent, increasing registration time.

If you have changed locations, switched to LTE, and still see alternating Searching and Emergency Calls Only, then perform a restart. This means a full power-off and power-on, not just locking the screen or toggling Airplane Mode for 5 seconds. A full restart forces the baseband to re-initialize, re-read the SIM configuration, and clear the failed network states from the previous round. For devices that have just switched network modes, changed default data lines, or manually selected multiple carriers, the first registration after a restart is cleaner.

If you have failed all three rounds—outdoors, LTE, and after a restart—and gave at least 30–90 seconds of waiting time for each round, then it is more appropriate to check the APN, plan regional coverage, and device lock status. Conversely, deleting the eSIM or re-scanning the QR code prematurely without completing these three steps often just disrupts a state that could still have been troubleshootable.

Verify Data Roaming is ON

Many internet issues with Denmark eSIMs are not “no signal,” but the eSIM is attached to the local network, but the phone has data roaming turned off. The result is usually: the status bar has 1–4 bars of signal, or even shows 4G/5G, but webpages won’t open, speed tests are near 0 Mbps, and map and chat apps keep spinning. Check this setting first; it usually takes only 10–30 seconds and is more worthwhile than restarting, deleting the card, or reinstalling.

How to Check

Don’t look at the signal bars first; see if this eSIM is being treated by the system as a “line that can access the internet.” Many phones exhibit the same state: 1–4 bars of signal in the top right corner, network type listed as LTE or 5G, but the webpage times out after 5–15 seconds, the map stays on the loading interface, and the chat app spins without sending messages. What to check here is not the plan balance or reinstallation, but entering the phone settings to verify the data line, roaming switch, and network registration status one by one.

First, confirm you are looking at the Denmark eSIM, not the primary card. One of the most common issues with dual-SIM phones is that users turn on roaming for the primary card page while the actual eSIM responsible for internet access is another one. iPhone is generally in Settings > Cellular; Android is generally in Settings > Network & Internet / SIMs / Mobile Network. Once inside, first verify 3 names: line label, the last digits of the phone number, and the plan name.

After entering the corresponding line, look at the most basic 4 switches/fields first; do not skip steps:

• Data Roaming / Roaming: ON
• Cellular Data / Mobile Data: Pointed to Denmark eSIM
• Line Status: Turn On This Line / SIM Enabled = ON
• Network Mode: 4G/5G/LTE Auto, do not lock to 3G first.

If the first item is off, the phone is likely registered to the local network but will not establish a data session. The surface phenomenon users see often resembles a “broken card”: signal exists, the network identifier exists, but actual download rates are near 0 Mbps. Speed test apps sometimes can’t even find a test node or get stuck during initialization for more than 10 seconds.

After checking the switches, verify if the data is actually going through this eSIM. Many people keep their primary card for SMS verification before departing, then install the travel eSIM in Denmark but forget to switch the mobile data over. The result: the eSIM is online, the primary card is also online, but the phone still prioritizes the primary card for internet. Verify in this order:

• The default voice line can remain the primary card.
• The default SMS line usually does not affect internet access.
• The mobile data line must be the Denmark eSIM.
• If the primary card still has Data Roaming on, it might compete for data in the background.
• For iPhone, it is recommended to turn off Allow Cellular Data Switching first.
• For Android, if “Auto switch data SIM” is enabled, it is also recommended to turn it off first.

After completing this level of verification, see if the status bar refreshes. Normally, after modifying roaming, the device will re-attach to the network within 10–60 seconds; some models take 1–2 minutes. If you just landed, just turned off Airplane Mode, or just switched from airport Wi-Fi to cellular, the registration process can occasionally drag on for 3–5 minutes. During this time, the status bar might switch between No Service, LTE, 5G, and blank a few times; do not judge it as a failure immediately.

To avoid just looking at settings and not results, it is recommended to do 3 small tests, each taking only a few dozen seconds:

• Open a standard webpage and see if the first screen loads within 3–8 seconds.
• Open a Map App to see if the location and base map update within 10 seconds.
• Use a speed test tool or browser to visit any page to confirm it’s not just an icon with no traffic.

If the webpage won’t open at all, but the signal bars and LTE/5G icons are present, usually look back at roaming and data line assignment again. If the webpage opens but is very slow, such as the homepage taking 15–30 seconds to appear, it means the network is connected, and the problem likely shifts to network congestion, frequency bands, APN, or local carrier selection.

Next, check the detailed prompts given by the system. On iPhone, there are two common types of feedback: one is no error message, just the page won’t open; the other will pop up “Could not activate cellular data network” or a similar prompt. On Android, it is more common for the notification bar to say “No internet”, an exclamation mark, or a small text reminder “Connected but no internet access.” The former mostly points to a data session not being established, while the latter often appears when the APN is wrong or the network is hooked to an inappropriate carrier.

To have the system re-initiate the connection, a network refresh is usually required. The order can be kept simple:

1. Keep Data Roaming = ON.
2. Turn on Airplane Mode for 10–15 seconds.
3. Turn off Airplane Mode.
4. Wait for 30–90 seconds.
5. Test the webpage or map again.

If there is no change, restart the device once.

Many phones will reload eSIM configurations, carrier parameters, internet sessions, and preferred networks after a restart. In actual use, the waiting time for connection recovery after a restart is mostly 1–3 minutes, with a few models taking longer. Do not restart 2–3 times consecutively here; observe if the status changes after once before deciding on the next step.

During the inspection process, it’s best to focus on “change” rather than “whether there is a full signal.” Full bars don’t mean data is through, and 1 bar doesn’t mean it definitely won’t work. The following items have more reference value:

• Changing from “no network identifier” to LTE / 5G.
• Whether data transmission arrows appear in the top bar.
• Whether the webpage goes from total timeout to opening slowly.
• Whether apps start sending and receiving messages automatically.
• Whether the system stops popping up cellular network errors.

If, after changing roaming, the status goes from “signal but 0 data” to “able to open webpages slowly,” it means the setting direction is correct, but there may be overlapping local network congestion or frequency switching. If it’s still completely blocked after changing, and there is no change after waiting for 2–5 minutes, checking the APN and manual network selection is more appropriate.

If it’s still not working at this point, check this group additionally:

• Whether primary card roaming is still on.
• Whether automatic switching of the data line is enabled.
• Whether the APN is empty or inconsistent with the supplier’s instructions.
• Whether network selection is stuck on automatic but registration keeps failing.
• Whether the current network mode is manually locked to 3G/2G.

There is also an easily overlooked situation: the user turned off a certain line to save power before departing; after arriving in Denmark, they only turned on the main “Cellular Data” switch but did not re-enable this eSIM line. You will see the roaming option in the page, but the line itself is in a closed state, and the system will not actually attach to the network. During inspection, you need to see that Line On / SIM Enabled / Turn On This Line is toggled on, not just that the menu is clickable.

Roaming is On but Still Not Working

After turning on data roaming, if the screen still shows No Service, only 1 bar of signal, or shows LTE/5G but the webpage won’t open for 10–20 consecutive seconds, the problem usually no longer lies with the switch itself. Many people at this step will repeatedly toggle roaming, restart 2–3 times, or even delete the eSIM; a more time-saving approach is to first judge which layer the phone is stuck on among “line assignment, network registration, APN, plan activation, or device compatibility.”

First, eliminate the most common layer: whether mobile data is actually going through this Denmark eSIM. In a dual-SIM scenario, the status bar can show both the primary card and the eSIM as online, but the system only allows 1 line to carry cellular data. The most common situation users encounter is—roaming is on, eSIM is enabled, but the phone still treats the primary card as the default data line. On the surface, it looks like “eSIM has no internet,” but actually, data isn’t going through it at all.

You can verify according to this group; the whole process usually takes 30–60 seconds:

• Whether Cellular Data / Mobile Data has selected the Denmark eSIM.
• Whether primary card Data Roaming is still on.
• Whether iPhone’s Allow Cellular Data Switching is turned off.
• Whether Android has “Auto switch data SIM” enabled.
• Whether the eSIM is set as the data priority, rather than just being enabled.

If the line assignment is fine, the next layer is to see if the network has actually registered successfully. You will encounter two very different visuals: one is consistently No Service; the other is the carrier name and LTE/5G appearing, but no available data. The former is closer to “not attached to the local network,” while the latter is closer to “attached, but data session not established.” The judgment direction and processing order are different.

Look at the first type first, which is not yet completing network registration. Within 1–5 minutes after landing, the phone will attempt to search for local networks, verify the eSIM, and match frequency bands and partner carriers. If automatic network selection fails, the device might switch back and forth between No Service, Emergency Calls Only, and 1 bar of signal. At this point, even if roaming is on, data cannot start because the voice/data registration itself isn’t finished.

You can check in the following order; do not skip:

• Turn on Airplane Mode for 10–15 seconds, then turn it off.
• Wait 30–90 seconds to see if the carrier name appears.
• If there’s still no change, enter the network selection page and turn off “Automatic”.
• Wait manually for the list to refresh, which usually takes 20–60 seconds.
• Try the registerable local networks one by one, giving the phone 30–60 seconds of reaction time each.

It is normal if you see 3–5 carriers in the network list but only some can be registered. Travel eSIMs do not necessarily support all networks in the list; they usually only support a subset of partner networks. Seeing a network name doesn’t mean it can be successfully attached; whether it can register depends on whether LTE/5G and data traffic arrows appear after switching.

If the network has registered successfully but you still can’t access the internet, the most common next layer is the APN. Many iPhones write the APN automatically, but not every eSIM or carrier combination succeeds every time. It’s even more common on Android: the eSIM is active, roaming is on, signal is normal, yet webpages all timeout; the reason is often that the APN is blank, misspelled, retains old values, or the system has not selected the correct APN configuration.

You can look for these symptoms first:

• Status bar has LTE/5G, but Speedtest can’t even find a server.
• Webpages remain blank after more than 15 seconds.
• Chat apps can occasionally send text, but images never go through.
• System prompts “Connected, no internet”.
• Signal changes after manual network switching, but data remains at 0.

If 2 or more items appear, it’s worth checking the APN. When verifying, don’t just look for “content”; check if it’s identical to the supplier’s instructions, including capitalization, dots, spaces, and whether a username/password is needed. Many configurations only require filling in 1 APN field and leaving the rest blank; filling in an additional old value can also cause the connection to fail.

If the APN is also correct, look further into whether the plan has entered an available state. Some travel eSIMs do not start timing immediately after payment but activate upon first connection to a supported network; others only become official upon arrival at the destination. In the first 5–30 minutes after installation, you might see the eSIM status as “added,” but the plan backend isn’t fully open yet. You can check 3 details in the supplier’s app or email:

• Whether the plan status displays Active / Started / In Use.
• Whether the destination includes Denmark, not just certain regions of Europe.
• Whether there is remaining data allowance, for example, 1 GB / 3 GB / 10 GB not yet exhausted.

If the plan page shows not activated, waiting for first connection, or pending, no matter how much you change roaming on the phone side, there won’t be stable data immediately. If the plan page shows activated and there is allowance, the problem is more related to phone settings or local network access.