Accessibility is available on the iPhone 4 and the iPod Touch 4th generation.

OverviewTaken from Apple.comEdit

Built-in accessibility. Accessibility comes standard on iPod touch. It’s built right into the operating system. And innovative features on iPod touch take accessibility a step further. Screen reading with VoiceOver. In addition to Voice Control, iPod touch features VoiceOver, the world’s first gesture-based screen reader. Instead of memorizing keyboard commands or pressing tiny arrow keys, you simply touch the screen to hear a description of the item under your finger, then double-tap, drag, or flick to control iPod touch. VoiceOver speaks 25 languages and works with all the applications built into iPod touch. And now, common VoiceOver keyboard commands are recognized by an external keyboard.

VoiceOver also features a virtual control called the rotor. Turning the rotor — by rotating two fingers on the screen as if you were turning a dial — changes the way VoiceOver moves through a document based on a setting you choose. For example, a flick up or down could move through text word by word or character by character, perfect for proofreading or editing text.