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You can turn off your own caller identification, your number will then not be shown at the receiving end when you make a call. Your number is only hidden when you make voice calls not when you send messages.
1. Find ""
Press the Menu key.
2. Turn your own caller identification on or off
Press to turn on caller identification.
Press to turn off caller identification.
3. Return to the home screen
Press the Home key to return to the home screen.