First I'm new to this flashing thing sort of - I'll explain that at the end. So, if I flash my S3 I will no longer receive firmware updates from MetroPcs (MP)? But, I can re-flash at some future date to get the latest "what" - Android enhancements and/or needed MP updates? What about the roaming lists etc. that get updated by MP? OK, the sort-of from my intro. I had a Sprint phone and went to a third party company that flashed my phone to MP and added some "stuff" provided by an MP tech. Yeah, I now had an MP phone functioning on 3G (few years ago), but the roaming did not behave like my wife's phone purchased from MP at the same time. So, you can see my motivation to be cautious. Right there with ya bsquirrel.