Getting a locked iPhone 7
I'm thinking of getting an iphone 7 from at&t, and paying full price for it. Does this automatically lock the iphone to at&t, and if it does, can i still use my old at&t sim card and plan on the iphone? My plan is prepaid. I believe my sim card is too big for the iphone 7 sim card slot, do i still have to get a new sim card or does the iphone 7 come with a sim card i can use and put my old plan on?