iPhone 2G, 3G, 3GS, and AT&T iPhone 4 are already "World Phones"...it is just the word "World Phone" was a marketing term by Verizon & Sprint to mean it has a GSM chip in it as well. Example: The BlackBerry 8800 was AT&T, and the 8830 was Verizon, the Verizon one had "World Edition" stamped on the front, even though the AT&T version works just fine around the world.