Quote from rosewattson on January 18, 2023, 3:51 am

It will be frustrating when you can not make or receive calls. Here are the reasons why this phone not registered on network problem occurs:

1. The SIM card is damaged or disabled
2. If you have updated your phone and the new version is not supported by your device
3. The firmware of your phone is not updated
4. If your device is the outrage of the carrier's network
5. If you have not selected your carrier's network after setting up your device