Cause 3 of 3: Barring of incoming calls is turned on
If barring of incoming calls is turned on, you can't receive any calls on your phone.
Solution: Turn off call barring.
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1 Find "Call Barring"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Call.
Press Call Barring.
2 Turn call barring on or off
Press the required barring type.
Key in your barring password and press ENABLE. The default barring password is 0000.
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3 Return to the home screen
Press the Home key to return to the home screen.