I installed the 3.0 software on my jailbroken iphone and I didn't revert it back to before it was jailbroken. Everything went fine however, I had downloaded a program from cydia in order to change my carrier name from AT&T to whatever I wanted (changed it to my yet to be born son's name Jackson) After the ugrade to 3.0 it apparently kept the carrier info (see photo) I wonder how this is going to affect me? the phone works like a charm, much faster than when it was jailbroken of course. Anyone else have these issues?