I assume regardless since you traded it in and they accepted that completely took off your balance even if you return itWhen I traded in my 6s for 7 Friday he said I had $299 balance for 6s. (I still had more payments to make I guess). I upgraded for Next 12 plan but I wonder if my balance is now $299 from previous 6s + new iphone 7 ... I may try to chat with ATT online.