Devices that are in all status are supported: In contract, Upgrade, AT&T Next Plan, Reported as well. Be aware reported devices won't work in USA, only overseas.
Supported Models :- and Many Other Models Also
Blackberry Z10, Q10 (Not Found Service)
HTC m8, Desire 610, Desire Eye
Asus PadFone X,
Nokia Lumia 520, 635, 820, 830, 900, 920 1520, 2520