iPhone 8
Select help topic
Turning your own caller identification on or off
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.
Press Settings.
Press Phone.
Press Show My Caller ID.
Press the indicator next to "Show My Caller ID" to turn the function on or off.
Press the Home key to return to the home screen.