iPhone is a device presented by Apple Inc. performing the function of a mobile phone, MP3 player (iPod) and Instant Messenger, as it has been called by Apple Inc. Everyone now is follow the trend of iphone. Nowadays, iphone is so famous.

The iPhone was first introduced by Steve Jobs on January 9, 2007 at the Macworld exhibition in San Francisco. On June 28, a day before the launch, Steve Job announced that every full-time and part-time employees of Apple, working at least one year for the company, would get an iPhone for free.

The iPhone was launched on June 29, 2007 in two versions, 4GB flash memory for $499 and 8GB flash memory for $599. Iphone touch screen responds to three sensors proximity sensor, light sensor and accelerometer. Iphone 5 is coming soon in this year 2011.