Watch that. Just like leased vehicles, ATT does have phone condition requirements in the fine print as part of the Next trade in program. These haven't been tested yet, but I fully expect a shed-load of posts when the 6S is released akin to "ATT won't give me full value because I used Apple Care and now I have a re-man!" -or- "ATT won't give me full value because of a slight scratch! I mean, you can barely see in in the glass!"-or-"CONFIRMED! ATT won't honor trade in with Next if you have a dent in the case! You are stuck until the full term...
If I can trade my phone in for $260 with no accessories and not worrying much about its condition, with no hassle, that's easily worth an additional $50-100 to me. ....
We'll see how it goes.