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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 "My number"
Press the phone icon.
Press the menu icon.
Press Calling accounts.
Press Advanced settings.
Press Additional settings.
Press the required SIM.
Press My number.
2. Turn your own caller identification on or off
Press Show number to turn on caller identification.
Press Hide number to turn off caller identification.
3. Return to the home screen
Press the Home key to return to the home screen.