The iPhone is an Internet-connected, multimedia smartphone designed and marketed by Apple Inc. Because its minimal hardware interface lacks a physical keyboard, the multi-touch screen renders a virtual keyboard when necessary. The iPhone functions as a camera phone (also including text messaging and visual voicemail), a portable media player (equivalent to a video iPod), and an Internet client (with email, web browsing, and Wi-Fi connectivity). The first-generation phone hardware was quad-band GSM with EDGE; the second generation added UMTS with HSDPA.

Apple announced the iPhone on January 9, 2007, after months of rumors and speculation. The original iPhone was introduced in the United States on June 29, 2007 before being marketed worldwide. Time magazine named it the Invention of the Year in 2007. Released July 11, 2008, the iPhone 3G supports faster 3G data speeds and assisted GPS. On March 17, 2009, Apple announced version 3.0 of the iPhone OS operating system for the iPhone (and iPod Touch), released on June 17, 2009. The iPhone 3GS was announced on June 8, 2009. It was released in the U.S., Canada and 6 European countries on June 19, in Australia and Japan on June 26, and will see international release in July and August.
Source: http://en.wikipedia.org/w/index.php?title=IPhone