An iOS update can change which line is enabled or selected for mobile data, and the iPhone may need to register again with the carrier.
The eSIM profile is usually still present. Check settings before assuming it was erased.
NoveSIM travel eSIMs are data-only. Their network, 5G and hotspot availability depend on the plan, iPhone model and local coverage.
Quick answer: Open Settings > Cellular, confirm the eSIM is present and turned on, select it for Cellular Data and enable Data Roaming. Check for a carrier-settings update, return Network Selection to Automatic and restart once. Do not delete the eSIM.
Confirm the Profile Is Still Installed
Open Settings > Cellular. If the line appears, tap it and enable Turn On This Line. If it is absent, do not rescan an old QR code immediately; contact the issuing provider with the order details.
Restore the Data Defaults
- Select the travel eSIM under Cellular Data.
- Turn off Allow Cellular Data Switching.
- Enable Data Roaming on the travel line.
- Keep Data Roaming off on the primary line.
- Set Network Selection to Automatic.
Apple confirms that only one mobile-data line is used at a time. Review mobile-data switching if the primary SIM takes over.
Check Carrier Settings and Registration
Connect to trusted Wi-Fi and open Settings > General > About. Accept a carrier-settings update if iOS offers one. Then use Airplane Mode for about 30 seconds and restart once.
If Signal Returns but Data Does Not
Test a website with Wi-Fi off. If the phone registers but has no internet, check the data troubleshooting sequence. For NoveSIM, use APN data.esim only when manual entry is required.
Avoid Destructive Fixes
Do not delete the eSIM, reset the entire iPhone or repeatedly scan the QR code. “Reset Network Settings” also removes saved Wi-Fi and other network configuration; use it only after provider or Apple guidance.
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FAQ
Can an iOS update remove an eSIM?
Normally the profile remains, but a line may be disabled or its defaults may change. Check Cellular settings first.
Why did iPhone switch back to my primary SIM?
The data selection or Allow Cellular Data Switching setting may have changed.
Should I reset Network Settings?
Not as a first step. It removes saved network settings and should follow targeted checks.
Should I delete and reinstall the eSIM?
No. Delete it only when NoveSIM Support explicitly instructs you to do so.
Final Recommendation
Check whether the profile exists, then restore line, data, roaming and automatic-network settings.
Update carrier settings and restart before touching the APN.
Keep the eSIM installed so Support can diagnose the original profile if the update exposed a carrier issue.
