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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 "Additional Settings"
Press the phone icon.
Press the menu icon.
Press Calling accounts.
Press Carrier Call Settings.
Press Additional Settings.
2. Turn your own caller identification on or off
Press the required SIM.
Press Owner's Number.
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.