I'm going to spend a couple of months in the Everest region, and I'd like to unlock my iPhone so I can use it while I'm there. One of my sherpa friends has an unlocked iphone. He inserts a chip which allows him to talk cheaply. I'd like to do this, but I can't find anyone who knows how to unlock the iPhones in the states. They all say if you buy one in Europe, it is easy. Any ideas?