Tap Tap Revenge the second-most downloaded free application of the year from their App Store, and the most downloaded free game. In April 2009, internet marketing research company comScore announced the results of a study which claimed 1 in 3 U.S. iPhone OS users had downloaded the game, and that it was the most popular application for the iPhone and iPod Touch. As part of the 2nd generation iPod touch advertising campaign, Apple featured "Tap Tap Revenge" in print and television ads with the headline "The funnest iPod ever.". The game spawned three direct sequels, "Tap Tap Revenge 2", "Tap Tap Revenge 3",
IPhone be accessed by a hardware button below the screen on all models expect for the iPhone X where the user must swipe up. The original iPhone contained the following apps: Messages (SMS and MMS messaging), Calendar, Photos, Camera, YouTube, Stocks, Maps (Google Maps), Weather, Voice Memos, Notes, Clock, Calculator, Settings and iTunes (store). The App Store was introduced for the iPhone 3GS and iPhone 4. Compass, FaceTime and GameCenter were added in iOS 4 and 4.1 respectively. In iOS 5, Reminders and Newsstand were added, and the iPod application was split into separate Music and Videos applications. iOS 6 added