I’ve been addict in upgrading firmware in my iphone and i’m a bit exited when i heard that 3.0 and 3.01 are out already so i immediately upgrade my firmware to 3.0 ,, firmware upgrading are success ,, a few days i realize my iphone become slower and battery lifetime become less,, and every time i charge my phone i notice that the unit become so hot so i thought it was a hardware problem,,, but luckily i have a friend who told me that its not your hardware its your firmware,, im a bit shock!!! but all the problem i been experiencing in my unit he know,, such as laggy texting , games, and springboard,, he know that my battery drain much faster and when im charging  my iphone becomes hot wifi signal becomes weak and network signal becomes weak,, so i decided to downgrade my unit to the stable firmware 2.2.1 and poof back to normal … so i learn that before upgrading try to search and read about the comment of the new firmware….