Troubleshooting

When the eSIM fails, the order of checks matters

Most first-day failures come from four settings, and none of them is fixed by deleting the profile.

This guide moves from the cheapest check to the last resort.

It also marks the point where the correct action is to stop and contact the provider.

Start with triage
Traveller at an airport window at dusk looking at a phone with a concerned expression
Independent guide  Ordered checks for travel eSIM failures Europe · eSIM · Mobile data
eSIM Troubleshooting Guide Diagnosis before reinstalling

Five failure patterns

Work through the pattern that matches what you see

Diagnosis 6 min read

Triage: four questions before changing any setting

The first question is whether the travel plan is enabled. A profile can be installed and switched off, and the phone will happily keep using the home line. Look at the SIM list and confirm the toggle is on for the travel profile. This single check resolves a surprising share of complaints.

The second question is whether that plan is the default line for mobile data. Installation does not automatically reassign data. On iPhone the setting sits in Mobile Data; on Android under the SIMs menu as the preferred SIM for mobile data. If your home line is still the default, everything will appear to work until the bill arrives.

The third question is whether roaming is enabled for the travel line, where the provider requires it. Many travel plans use partner networks, so the phone is technically roaming. Roaming is set per line: enable it for the travel profile, and leave the home line without it unless your tariff includes abroad usage.

The fourth question is whether the country is included in the plan. A profile that works perfectly in France may legitimately show no service in Switzerland. Check the provider's country list by name. If the country is excluded, no setting will help, and the correct next step is a different plan or a local SIM.

  • Is the travel plan switched on in the SIM list?
  • Is it the default line for mobile data?
  • Is roaming enabled for that line, as the provider requires?
  • Is the country you are standing in on the plan's list?
Installation 5 min read

The QR code will not scan, or the installation fails

Scanning problems are usually optical. A code displayed on a dim screen, printed too small, or curved on a luggage tag is hard to read. Increase screen brightness, avoid reflections, hold the phone about twenty centimetres away and wait for focus. If the code is on the same phone you are installing onto, stop trying to scan it and switch to manual entry.

A code that scans but is then rejected usually has one of three causes: it has already been used, it has expired, or the device is not eligible. Single-use codes are normal in this market, and a second attempt after a partial download can consume the token. Contact the provider with the order number rather than repeating the scan.

An installation that stops halfway is a connection problem more often than a server problem. Switch to a stable Wi-Fi network that is not the profile being installed, then ask the provider whether the profile must be reissued. Do not run the same code repeatedly: each attempt may invalidate the previous state.

  1. Improve lighting and screen brightness before rescanning.
  2. Confirm the code has not been used already.
  3. Switch to manual entry if the code is on the same device.
  4. Move to a stable connection and retry once.
  5. If it fails again, stop and contact the provider with the order number.
Network 7 min read

Installed, but no service or no registration

A phone that shows Searching or No Service is failing to register on a network, which is a different problem from failing to pass data. Registration depends on the plan being active, the device being unlocked, the network being available and the profile being allowed on it. Work through those four in that order.

If the plan is active and the device is unlocked, try selecting a network manually. On iPhone this is under Cellular, Network Selection; on Android under Mobile network, Network operators. Choose the partner network named in the provider's documentation if it appears. If every network is refused, the profile is probably not provisioned for the country you are in.

A carrier settings update can resolve registration failures that appear after a software change. On iPhone it usually arrives as a prompt and can be checked under General, About. On Android, provider configuration updates arrive through the system or the carrier's own app. Restarting the phone once after any of these changes is worth the thirty seconds.

Keep in mind A device that is carrier-locked may accept installation and then refuse registration on a foreign network. That is a commercial restriction, not a fault in the plan.
Data 6 min read

Connected, but nothing loads

If the status bar shows a network name and bars but pages do not open, the connection is registered but data is being blocked somewhere above it. The most common cause is the wrong data line: the phone is registered on the travel network for voice, while data is still routed to a home line that has no data allowance abroad.

The second cause is the access point configuration. Most travel eSIMs arrive with the correct APN preconfigured, but a missing or wrong APN produces exactly this symptom. Compare the APN shown for the travel SIM with the value in the provider's instructions. This is one of the few settings a traveller may genuinely need to edit manually.

The third cause is a data restriction rather than a network problem: data saver, background data limits, a VPN that fails to establish, or an allowance that has already been exhausted at low speed. Check the provider's usage page or app first, because a throttled or depleted plan looks identical to a misconfiguration from the outside.

  • Confirm the travel line is the default for mobile data, not just for calls.
  • Check the APN against the provider's instructions.
  • Switch off data saver and any VPN temporarily to isolate the cause.
  • Check remaining allowance before changing settings.
  • Try a single page in a browser rather than an app, which may cache.
Escalation 5 min read

When to stop, and why deletion is the wrong default

There is a point where further settings changes make things worse. If the provider's app reports the plan as inactive, if installation failed twice with a fresh connection, if the device is confirmed unlocked and the country is confirmed included, the problem is on the provider's side. Contact support with the order number, the device model, the country and a description of what you see.

Deleting the eSIM is the most over-recommended step in traveller forums. A deleted profile is removed from the chip, and the activation code that produced it is often single-use. What looks like a clean restart can turn a fixable configuration problem into a support ticket that takes days. Delete only when the provider instructs you to, in writing, and when they have confirmed a replacement.

The same applies to network settings reset and factory reset. Both remove saved Wi-Fi passwords and device configuration, and neither addresses a provisioning failure. A restart is cheap and worth doing; a reset is expensive and rarely the answer.

  • Provider reports the plan inactive: support case, not a settings problem.
  • Installation failed twice on a stable connection: ask for a new profile.
  • Device unlocked, country included, still no service: support case.
  • Never delete a profile without written confirmation that it can be reissued.

Diagnosis, in order

Five failure patterns, each with its own sequence

Traveller sitting beside a charging point in a quiet airport corner
Diagnosis 6 min read

The four questions that solve most first-day failures

Is the plan enabled, is it the data line, is roaming on for that line, and is the country included? Answer those before touching anything else, because every other action costs more and helps less.

Run the four checks
Installation 5 min read

The QR code will not scan

Lighting, screen reflections, single-use tokens and the manual route that bypasses the camera entirely.

Network 7 min read

Installed, but the phone shows no service

Registration failures, manual network selection, and the cases where the device is simply not suitable.

Data 6 min read

Connected, but nothing loads

APN, data saver, exhausted allowance and the wrong-line problem that looks exactly like a coverage failure.

Troubleshooting library

Five patterns, ordered from cheapest check to last resort

Failure topics

Four stages at which a travel eSIM can fail

  • 01

    Installation

    Codes that will not scan, downloads that stall and tokens that are consumed.

  • 02

    Registration

    No service, refused networks and the carrier lock that mimics a broken profile.

  • 03

    Data path

    Wrong line, APN, restrictions and allowances that present the same way.

  • 04

    Escalation

    When the fault is provider-side, and what to send in the support request.

Troubleshooting questions

Four that appear in almost every support thread

Should I delete the eSIM and install it again?

Only if the provider tells you to and confirms that the profile can be reissued. Deletion removes the profile from the chip, and many activation codes are single-use. Most problems are solved by checking the data line, roaming per line and country inclusion, none of which requires reinstalling.

The phone shows full signal but nothing loads. Why?

Signal strength describes the radio link, not the data path. The usual causes are the wrong default data line, a missing or incorrect APN, a data saver or VPN blocking traffic, or an exhausted allowance that has been throttled. Check the allowance first, then the data line, then the APN.

Do I need to switch roaming on for the travel eSIM?

Often yes, because a travel plan usually connects through a partner network and the phone treats that as roaming. Enable roaming for the travel line only, and keep it off for your home line unless your tariff includes usage abroad.

What should I include in a support request?

The order number, the device model and operating system version, the country you are in, the exact wording of any error, whether the device is carrier-unlocked, and a screenshot of the SIM settings. Providers resolve cases faster when the basic facts are in the first message.

Editorial note This guide describes a diagnostic order for common failures. It cannot see your device, your plan or your account, and it does not replace the provider's support. Where a step risks destroying a profile, the text says so explicitly.