Hello! I am trying desperately to unlock my iPhone 4 running iOS 4.2.1 and baseband 03.10.01. From what I am reading extensively online, it is my understanding that in the state of software versions I am in, I am kind of stuck in a rut! I am reading of other people upgrading software and baseband versions. I am nervous to try to proceed on my own as I understand that upgrading software/basebands are usually a one-way trip. Is there anyone that can provide me with a solution to unlock my jailbroken iPhone 4? Should I upgrade to 4.3.2? Will that upgrade my baseband to an unlockable baseband like 06.15.00? (Is 06.15.00 even an unlockable baseband?) Please help! Seriously appreciate anyone's advice on this.