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You can block certain types of calls such as incoming calls when you're abroad.
1. Find "Call barring"
Press the phone icon.
Press the menu icon.
Press More below the required SIM.
Press Call barring.
2. Turn call barring on or off
Press the indicator next to the required setting to turn the function on or off.
Key in your barring password and press OK. The default barring password is 0000.
3. Return to the home screen
Press the Home key to return to the home screen.