If your phone cannot make calls, please check if your phone is running the latest system version, the SIM card is not expired, the signal strength is above three bars, and the SIM card is compatible with the network standard.
If the issue persists, please refer to the following methods:
1. Try replacing the SIM card;
2. Try changing the location to rule out external interference affecting the phone’s signal;
3. Back up data and perform a factory reset without restoring the backup to rule out issues caused by communication APPs modifying system settings.
If none of the above methods resolve the issue, submit feedback through your phone for further inspection.