Apple releases its iOS 4 that includes 100 fresh features. Some of the highlights of the iOS 4 features are multitasking, folders, Even better Mail, iBooks, create playlists, 5x digital zoom, Tap to focus video, Faces and Places in Photos, Home screen wallpaper, Gift apps, Spell checking and Wireless keyboard support. The Operating system is compatible with iPhone 3G, 3GS, 4 and iPod touch models. Features such as multitasking, custom wallpaper and Bluetooth keyboard support are alone accessible with iPhone 4, iPhone 3GS and third-generation iPod touch. Its download is free for both iPhone and iPod Touch users, but it is incompatible with first-generation models.