Find "Call Barring Settings"
Press the menu icon.
Press Settings.
Press Call settings.
Press Call Barring Settings.
Change barring password
The current settings will be displayed.
Press Change Password.
Press Change Password.
Key in your barring password (the default is 0000).
Press the field next to New and key in the new barring password.
Press the field next to New and key in the new barring password.
Press the field next to Confirm and key in the new barring password again.
Press OK.
Exit
Press the Home key to return to standby mode.