I know that I tried to put fast ring on my 1520 and had problems with it from the start. Since replacing my 1520 with a 640XL (which is windows 10 compatible) it's worked pretty much like a charm. With the exception of the occasional reboot, I've been able to use it as my daily driver. My recommendation would be unless you're going to use one of the newer phones, I would wait. I know the 830 is compatible, but there are levels of compatibility. I was using the 520 as my test phone, but it just struggled too much. It's rumored that the 950 and 950XL will be available on ATT around late October or early November. If you've waited this long, what's another few weeks??