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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"
Select the phone icon.
Press the Left selection key.
Select Additional settings.
Select Caller ID.
2. Turn your own caller identification on or off
Select Show number to turn on caller identification.
Select Hide number to turn off caller identification.
3. Return to the home screen
Press Disconnect to return to the home screen.