A phone or tablet feature that has completely stopped should be checked for a disabled permission or setting before assuming hardware failure. For iPhone eSIM or cellular line, first check Settings for the line status and test the carrier QR/app on stable Wi-Fi.
What this covers
- iPhone eSIM or cellular line with this exact failure state
- Diagnosis across carrier provisioning versus device lock, line selection and activation network
What it does not cover
Try in this order
0 of 4 completedCapture the exact failure state
ReversibleCheck whether the feature is grayed out, missing from settings entirely, or present but unresponsive when used. Expected behavior: activate the intended carrier plan and remain selected for calls, texts and data.
Isolate the component boundary
ReversibleCheck Settings for the line status and test the carrier QR/app on stable Wi-Fi. Test the same feature in a different app that uses it, and with recently installed apps disabled or in Safe Mode. Boundary to separate: carrier provisioning versus device lock, line selection and activation network.
Correct only the proven cause
ReversibleHave the carrier reissue provisioning or correct the default voice/data line. Re-enable the permission or setting, or update/reinstall the one app where it fails.
Verify and stop safely
ReversibleConfirm the feature works from a cold restart in at least two different apps. Do not delete the only eSIM until the carrier confirms a replacement activation path.
Evidence ledger
Sources behind this answer
Exact questions