In the latest advertising campaign for its Sierra Wireless Overdrive 3G/4G WiFi hotspot, Sprint mocks AT&T and pokes fun at iPhone users whose smartphone is limited and whose style is cramped by the slow speeds on AT&T’s 3G network. In the world according to Sprint, the solution is not the next generation iPhone on the nation’s most improved network, but rather the slim and sleek Overdrive which can offer 4G connectivity to all those ailing iPhone handsets. Hit the jump to watch this clever, amusing, and possibly insulting promotional video.