Hi I was just wondering if somebody could clear something up for me. I've been researching the 4.2.1 jailbreak for iphone 4 and I haven't been able to find out if it requires me to unlock the phone or will I keep my AT&T service? I remember I once jailbroke an Iphone 3G I had a while ago and that required and unlock too, even on AT&T. So I'm just wondering if I need such a thing before I go through with my jailbreak. Thanks.