Find "Caller ID"
Press the menu icon.
Press Settings.
Press Call settings.
Press Call feature settings.
Press Additional settings.
Press Caller ID.
Turn your own caller identification on or off
Press Network default, Hide number or Show number.
Please note: you can only hide your caller identification for calls. When you send text or picture messages, your phone number is always displayed.
Exit
Press the Home key to return to standby mode.