First check that your destination is covered, the eSIM is enabled and the plan has not expired. See "My eSIM is not working: start here".
Start with automatic selection
Move to a place with better signal, briefly toggle airplane mode and allow the phone to register. A visible network name does not guarantee working mobile data.
Try a supported network manually
Only choose networks listed for your plan or confirmed by support.
- iPhone: Settings > Cellular or Mobile Data > the SimFuse line > Network Selection.
- Android: look under the selected SIM's mobile-network or network-operator settings. Names vary by manufacturer.
Turn off automatic selection, wait for the scan and try a supported network. If you do not know which networks are eligible, ask support instead of working through every network in the list.
Restore automatic selection if manual selection fails or when moving to another coverage area, unless support instructs otherwise.
If none registers, send support your country or city, network names tried, device model and exact error.