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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 "Show your caller ID"
Press the phone icon.
Press the menu icon.
Press Supplementary services.
Press Show your caller ID below the required SIM.
2. Turn your own caller identification on or off
Press Always to turn on caller identification.
Press Never to turn off caller identification.
3. Return to the home screen
Press the Home key to return to the home screen.