Now I consider myself a pretty experienced person when it comes to unlocking and updating my iPhone 2G. But this has totally thrown me for a loop. I currently have a 2.1 2G iPhone, that is unlocked only, NOT jailbroken. I unlocked/jailbreaked it when 2.0 came out and gave up with jailbreaking just deciding to update and stick with the App store. This has worked out fine..until now... I updated, eagerly awaiting the 2.2 update but when the update was finished, I was greeted with a activation screen on iTunes much to my surprise.iTunes said that my SIM card was not supported or something.(I'm using T-Mobile by the way.) I then quickly searched google, and found a way to downgrade to 2.1 and used my backup to restore my iPhone back to it's previous settings. So I'm at a loss here, I just tried updating again and the same thing happened so I'm really frustrated. I appreciate any help you can give me. Thank you.