Apple has posted its new iPhone 3G TV advertisement, named ”Hallway." First shown during today’s WWDC keynote address, the ad features a spy theme, with a mysterious package being moved down a hallway, and opened up to reveal an iPhone 3G. The narration says: “It’s finally here: the first phone to beat the iPhone. It surfs the web and downloads data twice as fast, for half the price. Introducing the new iPhone 3G.” The…