There was a low end “mystery” Lumia device picture leaked by @evleaks that was bearing an AT&T logo on the back. I have seen two different posts on this device and one claims it’s a Nokia Lumia 625 and the other claims it’s simply an AT&T branded Lumia 520. After looking at the back of the 520 and this device they seem to be same so I am going to go with the Lumia 520 claim. Here is the post claiming it’s a Lumia 625 and here is the post claiming it’s a Lumia 520. Take a good look at them both and decide for yourself.