Thought I would post this here as well...apologies for the redundancy. I have been using my iPhone 4 with iOS 4.3.2 jailbroken through PWNAGE Tool 4.3.2. I decided to use the iTunes 10.5 beta to install iOS 5 to check it out and quickly realized how unusable it is this early in the development. So I restored my iPhone 4 to the official iOS 4.3.3 and then used PWNAGE Tool v4.3.3 to create the custom firmware. Once installed, everything works on the iPhone except the cellular connection to AT&T. At the moment I am running my iPhone with the official iOS 4.3.3 and it works as it should. Troubleshooting so far: - Restored to official iOS 4.3.3 then created the custom firmware again and installed without the SIM card in - Verified the Modem Firmware (Baseband) is still 04.10.01 - Not sure if my IMEI or ICCID would have changed due to using iOS5 and connecting to AT&T's network (I don't think it could connect anyways) - Tried resetting the iPhone through Settings (Reset All Settings, Reset Network Settings) Questions: - Is there any other software on the iPhone that would prevent my SIM from connecting to AT&T's network when running iOS 4.3.3 jailbroken? - Would restoring/upgrading with iTunes 10.3.1 versus iTunes 10.5 beta make any difference? Any thoughts on this is appreciated. Thanks.