Hi. I have an iPhone 4 which is on OS 4.2.1 and I need it to be unlocked so I can use it with a different SIM, and carrier. I'm in a different country to where I bought it from. I've been reading different reports on wether it's possible to unlock and jailbreak the iPhone 4 and I figured you guys would know. If it's possible could you give me step by step instructions, or a link to a webpage that has them? Thanks in advance!