I am trying to unlock an iphone 4 on iOS 4.1 with 02.10.04 baseband. I don't mind upgrading the OS, the unlock is the primary objective. The issue I'm having is that there is no sim in the phone, itunes isn't recognizing it, and I can't seem to find how to either upgrade to 4.2 or unlock on 4.1. Anyone have a good idea how to proceed? (currently using Windows Vista ultimate). Thanks for your help!