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Just a side note: The "hot" area is USUALLY the lower part of the phone, right? I find that web surfing and heavy-video stuff will cause that area to get pretty warm. Presumably it is where the CPU for the phone is installed. The Battery is more to the upper/middle of the phone. Is THAT where it is getting HOT?
Every smart phone I've ever had gets hot while in use, but a couple of minutes is way too fast.
I know there are some people who have overclocked their device which of course will make it run hot. I don't know if that is your case though.