Even if AT&T discontinued it, they are only 1 carrier. Its available as a country varient (RM-938) which is nearly identical to the AT&T version, but its 100% unlocked, has twice the memory, and supports QI charging. That's what I have and I'm using it on AT&T and it works well.
I did see it on display in an AT&T store just a month or two ago, but a lot can happen in that time frame.