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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 settings.
Select SIM call settings.
Select Caller ID.
2. Turn your own caller identification on or off
If you want to turn on the function, select Send ID.
If you want to turn off the function, select Hide ID.
3. Return to the home screen
Press Disconnect repeatedly to return to the home screen.