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You can block certain types of calls such as incoming calls when you're abroad.
1. Find "Voice call"
Press the phone icon.
Press the menu icon.
Press Supplementary services.
Press Call barring below the required SIM.
Press Voice call.
2. Turn call barring on or off
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.
3. Return to the home screen
Press the Home key to return to the home screen.