We can also determine the person’s Google-Plus and Facebook profiles by just pasting the email address into the search bar: Few people know that it’s also possible to identify a Facebook profile by entering a mobile phone number.
Use Search to find the contact number of a friend you’re looking for. This helped me a lot to quickly find mobile numbers of facebook friends who are not there on my phone.
If you put your phone number on your Facebook profile, anybody can then find your details and location by just typing the number in Facebook search bar despite your privacy settings — and your details could be misused by cyber criminals.
If you login into your facebook profile, you will get search box on the top , there you can enter the unknown mobile number , if any person has registered through this number you will get the related profile information.
When adding phone numbers in the "Contact info" section of their respective Facebook profile pages, users can choose if they want to make this information
I believe my mobile number is not recognized/activated on my profile.
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Unlisted Phone Number Search.
If your Facebook friend has listed his mobile number on Facebook, or if he's got a Facebook app on his smartphone, it'll show right up.
Facebook logo. Email or Phone. Password.
Facebook users are discovering they have been sharing their phone numbers with other users in surprising ways. Is this the idea of openness you had in mind when you added your mobile phone number to Facebook?