Last week, i was upgrade my iPhone 2G to version 3.0 i found that my iphone get hot everytimes , only 4~5 hurs standby time after fully charge. On the other hand, iPhone was unable to receive phone call sometimes , also SMS . even the Signal Strength was shown as Maximum !! so what is the problem ? i found two things to prove , First , while i am putting my phone on my laptop , some "Zi ... Zi .... Zi " sound was out from my earphone ( loudly ) ! P.S. 1 ( Earphone is connected to my laptop ) P.S. 2 ( Already turn off the Push Message and Wi-fi ) after i downgrade to 2.2.1 , no more sound come out ! ..... Second , while i am playing Need for Speed , it is very very lag , after i switch to airplane more , no more lag !! .... All in All , i think that Apple was made a big mistake on the Firmware Network Modules , it will cause iPhone send out the Signal , Non-Stop and Fully Power. so it is the reason why my iPhone is hot , Short Standby time , Unable to receieve a call , etc i hope Apple will fix it as soon as possible .