
A 5.5-inch Retina HD display with 3D Touch. 7000 series aluminum and stronger cover glass. An A9 chip with 64-bit desktop-class architecture. All new 12MP iSight camera with Live Photos. Touch ID. Faster LTE and Wi-Fi. Long battery life and iOS 9 and iCloud. All in a smooth, continuous unibody design.
A: Not certain if at&t still offers the 6s or 6s plus models but if so then yes you can trade in towards the purchase of them. You may not like the trade in value they will give you towards the iPhone though. I would sale the S7 to an individual and just purchase one straight out. Refurbished starting at 125.00 and new unlocked around 300.00. Hope this helps.