Call display allows you to see the number of the person who is calling.
If a caller’s number has been saved on your mobile phone or SIM card, their name and their photo, if supported by your mobile phone, will be displayed.
Yes, using your mobile phone’s settings, you can permanently hide your number on every call you make. For more information, refer to your mobile phone’s user guide. To hide your number temporarily on a given call, first enter #31# and then the number you want to reach before pressing SEND.