Wish ATT had the same deal as Sprint. I got my iphone 7 on a deal like that where monthly credits paid for the phone and I would jump at that deal again.
We just went to the ATT for the BOGO deal and were told that we had to buy a new line. Regardless that we already pay ATT $243 monthly for the bundled products...
Please do better research. ATT requires buying a new line AND DirectTV subscription of at least $29.99 or higher. This greatly devalues the "bogo" deal you're referencing.
1. Your table of remaining costs for XS after trade-in is way off, possibly inverted?
2. Your comment on T Mobile deal of $750 instant credit is no credit. You pay $250 today and $750 in payments of $20.84/mo for 36 months. The value is in the trade in only.