The phone with the model number Samsung SM-G900A has been mentioned about a month ago by @evleaks when we learned that AT&T might be testing this high-rez device which might be an international flagship, maybe even the Galaxy S 5 (which pops up more and more often as we’re getting closer and closer to its refresh cycle).
This phone is listed in the User Agent Profile document linked at the source below, but, interestingly, contrary to rumors of a QHD (2560×1440) screen, it is listed with a Full HD (1920×1080) display. Here’s where the information stops and the speculation starts; depending on who you tend to believe, this is either the “cheaper” version of the S 5 (made of plastic) which would not sport the 2K display, or it might not be the S 5 at all. Some also believe that this is indeed the next S-series device, with the proper model number, but with tampered specs to conceal the real deal, and some believe this could be the F-series device we heard about for quite some time now. We’ll just file this under “miscellaneous” and move on.