Technically it is not the first boot up since the store employee started it for me to show me features. But when I went home, I turned it on for the first time myself and noticed after about 4 minutes the phone started getting warm. Not warm as in me holding it for a long time but the phone itself. I set the phone down on standby and came back to it later. It has never been that warm ever since. Any ideas on why the first boot up was warm? I was not doing anything crazy nor have the settings changed on my phone to make it "cooler" since then. I surf on wifi sometimes and it still does not get as warm as it did that one particular time. Also, the phone has an automatic shut off system where if it gets too hot it will turn off right? Will it also turn off if JUST the battery gets hot, or is the automatic system designed for the actual phone temperature only and not the battery.