I just updated the iPhone to 4.2.1 Firmware. It is a 3g model. Now I am stuck at "EMERGENCY CALLS ONLY" I need to unlock it because I want to use my T-Mobile Sim Card. Can someone link me to the best video on How to unlock the phone on a Mac or PC? EDIT: Will this video work since I've updated? http://www.youtube.com/watch?v=gP6smWHvtq8&annotation_id=annotation_165989&feature=iv Thanks!