A frustrating situation can occur where seemingly at random your contacts names are not showing on iPhone, instead only displaying the numbers. When this happens, when you launch Phone app to make or receive a call, you will only see a phone number rather than the contact name, and likewise Messages shows only contact numbers rather than names. Often if you start seeing only contacts numbers rather than names, this can cause some panic for iPhone users as it gives the impression that you have lost all your contacts information and contacts names on the iPhone.