Many of us don’t want others to have access to our contacts personal phone numbers on Facebook
Internet Guru Girl has the very simple directions on how to eliminate this feature in your Facebook profile:

Account Setting – in top right corner
Edit friends – choose this from drop down menu
Contacts – which is in the top left column
This page – the paragraph to the right column says you can click here and enable
(This is how you will hide your contacts personal ph#’s in Facebook off your profile)