The iPhone is an internet and multimedia enabled smartphone. The iPhone functions as a camera phone (also including text messaging and visual voicemail where supported), a portable media player (equivalent to a video iPod), and an Internet client (with email, web browser, and Wi-Fi connectivity) - using the phone's multi-touch screen to render a virtual keyboard in lieu of a physical keyboard. The iPhone has currently had four revisions, starting with the iPhone (released in 2007), the iPhone 3G (released in 2008), the iPhone 3GS (released in 2009) and the most current revision, the iPhone 4 (released in 2010).
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