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You can block certain types of calls such as incoming calls when you're abroad.
Press the call icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press the name of the SIM.
Press More.
Press 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.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.