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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 "Hide ID"
Press the Left selection key.
Select Call settings.
Select Hide ID.
2. Turn your own caller identification on or off
Select Display own ID to turn on the function.
Select Hide ID to turn off the function.
3. Return to the home screen
Press the Home key to return to the home screen.