Hello my first Tmobile galaxy s 2 ran hot often and I wasn't convinced this was normal. So I exchanged mine and so far no heat problems with the second one. I also had read on some other sites that some peoples were runing hot at times. I just wanna let others know so they have a chance to exchange there's in time. I think it's a factory defect during production some of samsung workers dropped the ball. It happens in every company.