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You can change the barring password. Follow these instructions to change your barring password.
Find "Change password"
Press the menu icon.
Press Call settings.
Press Call barring.
Press Change password.
Change barring password
Key in your current barring password (default is 0000) and press OK.
Key in a new call barring password and press OK.
Key in the new call barring password again and press OK.
Press the Home key to return to standby mode.