Well here i am going to show how to Find Facebook friends phone Numbers from here. Facebook stores your email address and also your phone book numbers in their database for find your relevant friend. If you don't want to share your contact numbers and email address then, You can remove access by follow some instruction given below easily. Let's go ahead
Log in to Facebook
Click on below link or Manually write on your address-bar
=>For PC
http://www.facebook.com/phonebook
or
http://www.facebook.com/friends/?view=phonebook=>For Mobile
http://www.facebook.com/mobile/?phonebookDone