
BlackBerry Bold 9790
Find "Call Blocking"
Press Connect.
Press the Menu key.
Press Options.
Press Call Blocking.
Change barring password
Press the Menu key.
Press Change Password.
Key in your current barring password (default is 1919) and press the Navigation key.
Key in the new barring password and press the Navigation key.
Key in the new call barring password again and press the Navigation key.
Exit
Press Disconnect to return to standby mode.