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You can block certain types of calls such as incoming calls when you're abroad.
1. Find "Call Barring"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Call Barring.
2. Turn call barring on or off
Press the required barring type.
Key in your barring password and press TURN ON. The default barring password is 1919.
3. Return to the home screen
Press the Home key to return to the home screen.