So I bought a used galaxy s7, but too wrapped up in the deal I was getting (the whole thing was only $75) I neglected it was the AT&T model (sm-g930a). Currently, it is not sim unlocked and I do not have a warranty. I was going to unlock the phone first. Then i was going to install the g930u firmware, which is the basic firmware and works on all S7 models. Then I would get a sprint 4g LTE card. The problem is I don't know what sim cards work in my phone, and I can't get an actual contract with sprint because i plan to use another carrier who uses sprint towers. So the question is which ones can i get that will work or is there another solution I could use.
Read more: Help with converting an AT&T Galaxy S7 to Sprint