You can find your friends’ phone numbers by going to the “Phonebook” tab in the Mobile application. Only the numbers that you can normally view on your friends’ profiles will appear in this list.
Click the “account” link in the upper right hand corner.
Then click the “Mobile” tab.
Look to the bottom of the screen. You’ll see a blue link that says “Go to Facebook Mobile.” Click it.
Look towards the top of the screen. You’ll see 3 links: Mobile Uploads, Phonebook, and Account. Click “Phonebook.”
Now you should be able to see all the phone numbers of your Facebook friends who have added their phone number to their profile.
You can Visit directly to Fb Phonebook by Clicking in this Link