How to activate or deactivate your own caller identification
You can deactivate your own caller identification, your number will then not be displayed at the receiving end when you make a call. You can also make one call with hidden caller identification. Your number is only hidden when you make voice calls not when you send messages.
Find "Show my caller ID"
Press More settings.
After a moment the current settings are displayed.
Press Show my caller ID.
Activate or deactivate your own caller identification
Press Hide number or Show number.
Return to the Home screen
Press the Home key to end the session and return to the Home screen.