eSIM connection problems affect roughly 5% to 8% of installations based on aggregated support data from major providers. The good news is that almost every issue has a straightforward fix. This guide walks through the most common eSIM problems in order of frequency and provides tested solutions for each.
Start from the top and work down until your issue is resolved.
Step-by-step instructions
- 1
Fix 'No Service' or 'Searching' errors
Toggle Airplane Mode on from Control Center (iPhone) or Quick Settings (Android). Wait 30 seconds. Toggle it off.
This forces a network re-registration. If the error persists, go to Settings > Cellular > select your eSIM > Network Selection > switch from Automatic to Manual. Pick a carrier from the list, wait 30 seconds, then switch back to Automatic.
If you are using a travel eSIM at home before your trip, 'No Service' is expected until you arrive at the destination country.
Tip: If manual network selection shows zero carriers, the issue is likely a carrier lock or regional coverage gap, not a phone configuration problem.
- 2
Fix 'Carrier could not be contacted' during activation
This error means your phone cannot reach the provider's SM-DP+ server. Switch to a different Wi-Fi network or use a mobile hotspot. VPNs and corporate firewalls sometimes block the SM-DP+ server port.
Disable any VPN before retrying. If the QR code reports 'already used' or 'invalid,' check your SIM settings because the profile may have downloaded silently even though the activation appeared to fail.
Tip: The SM-DP+ download uses HTTPS on port 443. If you are on a restricted network (hotel, airport, corporate), try a mobile hotspot from a phone on a carrier network.
- 3
Fix connected but no data (signal bars but no internet)
This is almost always an APN or data roaming issue. On iPhone, go to Settings > Cellular > Cellular Data Network and verify the APN matches your provider's documentation. On Android, go to Settings > Network & internet > SIMs > select eSIM > Access Point Names.
If the APN is empty or wrong, add it manually. Then enable data roaming: Settings > Cellular > select eSIM > Data Roaming on iPhone, or Settings > Network & internet > SIMs > select eSIM > Roaming on Android.
Tip: Some providers auto-configure the APN. If yours shows a correct APN and data still does not work, delete the APN entry and restart your phone. The correct APN often re-installs automatically on restart.
- 4
Fix activation failure on carrier-locked devices
Carrier-locked phones only accept eSIMs from the locking carrier. Third-party travel eSIM profiles will fail with 'Unable to add cellular plan' or similar errors. Check your lock status: iPhone > Settings > General > About > Carrier Lock.
Android > Settings > About Phone > SIM Lock Status. If locked, contact your carrier to unlock the device. In the US, T-Mobile and AT&T process unlocks within 2 business days for eligible devices.
Verizon auto-unlocks postpaid phones after full payment.
Frequently asked questions
Why is my eSIM speed very slow?
Slow speeds (under 1Mbps) usually point to APN misconfiguration or network congestion. Check the APN settings first. If the APN is correct, the local carrier network may be congested. Try manually selecting a different network operator under Network Selection in your SIM settings. Some destinations have multiple partner networks, and the automatically selected one may be overloaded.
My eSIM worked yesterday but stopped today. What happened?
The most common cause is plan expiration. Check your provider's app for remaining data and validity. If the plan is still active, toggle Airplane Mode on and off. If that fails, try a network settings reset (Settings > General > Reset > Reset Network Settings on iPhone). The second most common cause is a network outage at the local carrier, which resolves on its own within hours.
Should I contact my eSIM provider or my carrier for connection issues?
Contact your eSIM provider first. They can check whether your profile is active on their system, verify your data balance, and re-provision a new QR code if needed. Only contact the local carrier if the provider confirms the profile is active and your phone has correct settings but still cannot connect, which indicates a local network issue.
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