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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 "Caller ID"
Press the Navigation key.
Select Call setup.
Select Caller ID.
2. Turn your own caller identification on or off
Select Send ID to turn on the function.
Select Hide ID to turn off the function.
3. Return to the home screen
Press Disconnect to return to the home screen.