Hi. Can someone who doesn't mind please post some easy steps on how to use ZiPhone and what it basically does (I'm a complete novice to all this unlocking)? If I were to use it will I still need to wait for a ZiPhone update until I can install the latest iPhone firmware? How do the other and more common iPhone unlocking solutions work? I am planning on buying an iPhone when I go the U.S. in about a week and then use it when I'm back home in the U.K. If I use ZiPhone or another unlocking solution will my sim card still work in it? Thanks.