Find "Change password"
Press the menu icon.
Press Settings.
Press Call.
Press Call barring settings.
Press Change password.
Change barring password
Key in the 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.
A request to change the setting is sent to the network.
A request to change the setting is sent to the network.
Press OK.
Exit
Press the Home key to return to standby mode.