Many of you, like me, use Google Contacts to manage your personal address book (contacts.google.com). If that's the case, then starting today we'll include this contact info on your friends' Google+ profiles -- for your eyes only, of course.
This way, if you have your roommate's new phone number in Google Contacts, it'll also be available when you stop by his profile. Just look for the new "Details from Google Contacts" section (see screenshot).
As always, let us know what you think in the comments!