I am VERY excited to finally be able to upgrade to 4.3.1 AND keep my unlock for T-Mobile. Since I have been stuck at 4.0 because the previous owner didnt save the SHSH blobs, it is especially welcoming. Anyway, is there a guide that I am okay to follow when upgrading and jailbreaking my iPhone 4? I am quite nervous about this whole process since if I foul something up I will be stuck with an iPhone 4 that will be useless to me. Thanks as always. You all are great.