oddly enough, I did the exact same thing.............except I just shattered the screen on my 950, after 1 drop - I dropped my icon a ton of times, never a crack. Either way, have to send my 950 out for repair (200$) to fix it, and it takes 2 weeks - too bad the flagship Microsoft store in NYC couldn't repair the phone. IPhone users can make an appointment in any apple store, and have their screen replaced within 30 minutes, and it costs less...........oh well. I have since popped my AT&T sim card into my Icon again and am using it on a temporary basis (I wasn't expecting it to work, but it seems to be on H, H+ ATT network with no issues as of yet. I have noticed that W8.1 is indeed faster than WM10. On the same wifi, IE on 8.1 opened websites better, and was generally just as responsive on html targets. Transitions between apps, and home screen are also faster on 8.1, with lesser hardware. Not that they are slow or laggy on W10M, they are just faster on 8.1. All that being said, the advantages of 10 and UWA apps are far better.