Hide Your Mobile Phone Number
In August, Facebook users revolted when they discovered what they thought was Facebook exposing their mobile phone numbers. Facebook later clarified that wasn't the case, but it was a good reminder to check all your privacy settings.
To remove your phone number or adjust your settings, view your profile then select Edit Profile > Contact Information. In the middle is a "Phones" section where you can add or remove your phone number, and control who can see it from the drop-down menu beside it.
Once you receive Timelines, you'll click "Update Info" under your cover photo, scroll to "Contact Info" and select your desired setting next to "Phone."