I'm probably going to get some heat for this, but I never upgraded from 3.0. Everything was working so good, I just never went to the trouble of going to 3.1 and higher. Now, however, more and more apps that I need won't run on anything less than 3.1.2. I'm happy staying with AT&T so I don't need to unlock, but can I jailbreak on 3.1.3? Thanks!