Cause 2 of 3: Divert of all calls is turned on
If divert of all calls is turned on, you can't receive any calls on your phone.
Solution: Cancel all diverts.
1 Find "Call forwarding"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Call.
Press Call forwarding.
2 Cancel all diverts
Press Voice.
Press the required divert type.
Press TURN OFF.
3 Return to the home screen
Press the Home key to return to the home screen.