Well with all of the fragmentation, I'm sure a lot of people are running different things. Right now I'm running 4.0.3 on my rezound. It's nonrooted, I just put the stable official leak with sense 3.6. I absolutely love it. If you don't know how to check it, go to your settings and go to about. In there it should tell you, if not go to software information. So what's yours? This is for Androids hence being in that section! Edit: My Rezound is now rooted on the stock ROM! Looking at the GS4 for my next phone Edit 2: I decided to buy the HTC One on Verizon at full price to keep my Unlimited data. This is an incredible phone and I'm currently on 4.3.