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You can block certain types of calls such as incoming calls when you're abroad.
1. Find "Call Setup"
Press the Menu key.
Press Call settings.
Press Call Setup.
2. Turn call barring on or off
Press the field below "Call barring".
Press the indicator next to the required barring type to turn the function on or off.
Key in your barring password and press OK. The default barring password is 1919.
Press the confirm icon.
3. Return to the home screen
Press the Home key to return to the home screen.