I've owned several of these phones and to this day ... This phone style had many model #'s depending on which carrier it was on. Nokia 5160, 5160i, 5165 were the few that AT&T carried.

This was my first phone. I got it on AT&T Wireless (i miss them...) For some reason though, the Model # under the battery says 5160i but i searched for that model and it isnt even listed in Nokia ...