Find "Additional settings"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.
Press Call.
Press Additional settings.
Turn your own caller identification on or off
The current settings are displayed.
Press Caller ID.
Press Caller ID.
Press Network default, Hide number or Show number.
Return to the home screen
Press the Home key several times to return to the home screen.