I was not sure if I have follow step by step in order to upgrade IOS. I still have the same IOS since I bought new. (Iphone4) Anyway I contacted ATT where I bought, I asked if he could help me download. He said no. Their office doesnt have computer for that so he suggested to do at home. He said connect Itune. So I did. I downloaded on my PC Lap top. Then next step Sync. It took some time to transfer upgrade IOS then suddenly my Iphone froze. I turned it off and turn it back on (reboot) but still froze. There is an icon picture of itune with arrow head and usb cord. I tried few time to turn it off again and came up same. How do you get your Iphone4 back to normal? Or reboot? Unless I did something wrong? Thanks!