I just upgraded to 3.0 and I want to jailbreak it. I want to use it with t-mobile. Also, I have music from media monkey, so would I HAVE to restore it because I upgraded to 3.0, and all my music is still there. I think I heard that I have to upgrade AND restore the iPhone once it has been upgraded to 3.0. Is that true? Do I have to restore my iPhone? I don't mind, but it is kind of a hassle for me, lol. Thanks.