I own both phones. The AT&T 810 and the international 815. To my surprise every speed test that I have done the AT&T version is faster than the international 815. Can’t explain it I would assume that each phone had the same hardware. My 815 and my 810 running on the same LTE band and I have tried different speed tests in different parts of the city even when the LTE band changed. For data download the AT&T is much faster. Again I have tested both phones side-by-side over and over and I would have assumed the 815 would’ve been the same or a little quicker. Even when I ran the quadrant speed test the AT&T beat my international version, not by that much but it still was faster poster just.
On top of this, my wife has a S6 edge and it beats my 815 in all the speed tests, it’s comparable to my 810.
On top of this, my wife has a S6 edge and it beats my 815 in all the speed tests, it’s comparable to my 810.