FAIRPHONE Fairphone 4
It's not possible to receive voice calls
Solution 1 of 3: Divert of all calls is turned on
If you no longer wish to divert your calls, you need to cancel the diverts.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press the name of the SIM.
Press GSM call settings.
Press Call forwarding.
Press Voice.
Press the required divert type.
Press TURN OFF.
Press the Home key to return to the home screen.