I have my telephone number in my About area and the Facebook search engine returns simply my profile, so you know that's the best one.
How To Find Someone On Facebook By Phone Number
However here's a search I did by telephone number for someone I'm not linked to and who does not have their contact number in their public profile. (Sorry for the blurring-- to safeguard the innocent victim of my research.).
The Best Ways To Conceal Contact Information on Facebook.
1. Once again go to your account, click on the [Accounts] tab and choose Privacy Settings link.
2. On the Privacy Settings page, scroll down and click Customize settings link (see picture. above).
3. On the Customize settings page scroll down to discover Contact details section and it will reveal you all the contact details and whom you enable to see it.
4. Click any one of the contact details. like mobile number and pick the type of individuals who can see/access it. If you desire to hide your contact number on facebook entirely from everyone pick Customize. (see above).
5. In the next window under Make this noticeable to you can pick the choice Just Me or the others.
How To Find Someone On Facebook By Phone Number, By picking "Only Me" youre specifying that only you can see that contact information on your facebook profile, while the rest of the world will not see it at all or access from their phonebook page, unless you specify specific people in the above step to see them.