The new application for iphone 3GS can to get  in apple app store but application waiting approve with apple.The application are acrossair for augmented reality application for the iPhone 3GS.The acrossair  is magnify reality apps will be some thing for the iPhone 3GS.The acrossair  magnify reality app tells you where the nearest tube station is via the iPhones video function.The acrossair implemented the app for the London tube system.With acrossair all 13 lines of the London Underground will be colored arrows. By tilting the phone up, you see the next stages: in what direction they are in relation to your location, how many miles and miles away they are and what they are Tube Lines. If you continue to tilt the phone up, you will see that stations further away, as stacked icons.Do you want to use acrossair app?you must waiting in apple app store for your iphone 3GS.