Read help info
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 My Number"
Press the phone icon.
Press the menu icon.
Press Show My Number.
2. Turn your own caller identification on or off
Press the indicator next to "Allow My Number To Appear When Calling" to turn caller identification on or off.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.