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You installed a travel eSIM, landed, and... no signal or no data. Most problems come down to a few settings. Work through these steps in order before contacting support; they fix the large majority of issues.
Key takeaways
- Make sure the eSIM line is turned on and set for cellular data.
- Many travel eSIMs need data roaming turned on for the eSIM line.
- Restart the phone or select a network manually.
- Still stuck? Check APN settings and contact the provider, which can check activation.
Step 1: Check line settings
Make sure the eSIM is on and set for cellular data.
iPhone
- Settings, then Cellular. Tap the travel line and make sure "Turn On This Line" is on.
- Tap Cellular Data and choose the travel line.
- Turn off "Allow Cellular Data Switching" if you don't want data to fall back to your home line.
Android
- Settings, then Network & internet (or Connections), then SIMs.
- Make sure the travel eSIM is turned on.
- Set Mobile data to the travel eSIM.
Step 2: Data roaming
Many travel eSIMs need data roaming turned on for the eSIM line. Because the eSIM uses partner networks abroad, your phone treats it as roaming. Turning on roaming for the travel line doesn't create charges on your home line, as long as roaming stays off on the home line.
- iPhone: Settings, Cellular, tap the travel line, then turn on Data Roaming.
- Android: Settings, SIMs, tap the travel eSIM, then turn on Roaming.
Step 3: Restart and network selection
Restart the phone or select a network manually. 1. Turn airplane mode on for 15 seconds, then off. 2. If that doesn't work, restart the phone. 3. Turn off automatic network selection and pick a supported network from the list. Your provider's instructions usually name the partner networks for each country. 4. If the phone connects but shows no data, try a different network from the list.
Step 4: Check the APN
An APN (access point name) tells your phone how to connect to the provider's data network. Most eSIMs set it automatically, but sometimes you need to enter it. - iPhone: Settings, Cellular, tap the travel line, then Cellular Data Network. Enter the APN from your provider. - Android: Settings, SIMs, tap the eSIM, then Access Point Names. Add the APN from your provider.
Step 5: Check the plan
- Has the plan started? Some activate on install, others when you first connect abroad.
- Is your destination covered by the plan?
- Has the data allowance run out or the validity expired?
- Did the plan require activation in the provider's app?
Step 6: Contact support
The provider can check activation and APN settings. Have your order number, phone model, iOS or Android version, and the country and networks you've tried ready. Screenshots of your cellular settings help.
Troubleshooting table
| Symptom | Likely fix |
|---|---|
| No signal on travel line | Turn line on; select network manually |
| Signal but no data | Turn on data roaming for the eSIM; check APN |
| Data works then stops | Check remaining data and validity |
| "SIM not supported" | Phone may be carrier locked |
| Very slow data | Try another partner network; check for speed caps after a limit |
| eSIM disappeared | Don't delete it; contact provider, as many can't be reinstalled |
Don't delete the eSIM
It's tempting to remove and reinstall an eSIM, but many travel eSIMs can only be installed once. Deleting it may mean buying a new one. Always ask the provider before removing it.
Prevent problems before you fly
- Install the eSIM at home on Wi-Fi.
- Label the lines clearly.
- Save the provider's APN and support contact details offline.
- Download offline maps in case you land without data.
- Know where to find free airport Wi-Fi.
Our step-by-step travel eSIM setup guide walks through the whole process. If your phone may not support eSIM at all, see does my phone support eSIM?
When the problem is the network
Coverage can be weak in rural areas, on trains, or inside large buildings, no matter which SIM you use. If other travelers on different networks also have no signal, wait until you move. If only you have problems, the steps above or the provider's support are the next move.
Check for a software update
Older iOS or Android versions occasionally have eSIM bugs. If nothing else works and you're on Wi-Fi, check Settings for a system update, but avoid large downloads over your travel data.
Frequently asked questions
Why is my travel eSIM not connecting?
The most common causes are the eSIM line being off, data roaming disabled for the eSIM, or the phone using the wrong line for data. Turning those on and restarting fixes most cases.
Do I need data roaming on for an eSIM?
Many travel eSIMs require data roaming to be turned on for the eSIM line, because they use partner networks abroad. Keep roaming off on your home line to avoid charges.
Can I reinstall a travel eSIM?
Often not. Many travel eSIMs can only be installed once, so contact the provider before deleting one.
What is an APN and do I need to set it?
An APN tells your phone how to connect to a data network. Most eSIMs set it automatically. If data doesn't work, enter the APN your provider gives you.
Sources
Official sources this article relies on, checked October 15, 2026. Rules and prices change, so confirm details at the source.
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