I’ve had people commenting (complaining) on one of my privacy blogs, that their mobile number is available to view on FaceBook even when they deliberately withheld their number from their Profile.
Well, it’s the “FaceBook App” – if you download the app so that you can view and update your facebook page via your mobile, then your mobile number is automatically extracted & displayed.
If you have internet access on your mobile go directly to their mobile site at touch.facebook.com (type it in your browser address bar).
This way you don’t have to download the “facebook app” it’s the app that gives them access to your phone numbers (and those of your friends in the contact list / phonebook if you inadvertantly allow it).