Sprint iPhone in advanced testing http://www.9to5mac.com/71341/sprint-iphone-in-advanced-testing/ Sources tell 9to5Mac that a version of the iPhone for Sprints network is currently in advanced testing. The physical design of this device is akin to the iPhone 4 of today, so this might be the iPhone 4S device with support for all carriers that we have been dreaming up and hearing whispers about. Apple have ordered Sprint-compatible cell towers for use on their campus for testing in late 2010. Apple similarly tested the Verizon iPhone against Verizon cell towers on their campus months before the products release. In addition to being actively tested in Apples black labs, the device is making the rounds amongst Sprints research and development department, the first generation Sprint iPhone that is currently in testing does not feature support for 4G bands.