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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.
Find "Hide my caller ID"
Press the Menu key.
Press Call settings.
Press Additional call settings.
Press Hide my caller ID.
Turn your own caller identification on or off
Press hide or unhide.
Return to the home screen
Press the Home key to return to the home screen.