iPhone 4G with HD 32GB Factory Unlocked is the thinnest, highest resolution, best camera, HD video recording, video calling, extended battery life iPhone from Apple. The best part is they are factory unlocked to be used on ANY GSM carrier worldwide! When creating iPhone 4, Apple designers and engineers didn’t start with a clean sheet of paper. They started with three years of experience designing and building the phones that redefined what a phone can do. iPhone 4 is the result of everything they’ve learned so far. And it’s all contained in a beautiful enclosure a mere 9.3 millimeters thin, making iPhone 4 the world’s thinnest smartphone.