Jordy with AT&T teaches us how to block your cell phone number when making outgoing calls. By doing this, any person you call cannot read your ten digit cell phone number. It's as simple as entering a code before you dial the desired number. The code is *67 followed by the ten digit number and then placing it as a regular call. This does not allow the person you are calling to see your number. Instead it will show up on their caller ID and read as "Private Caller". Follow Jordy's advice and keep certain people from knowing what your number is.