The iPhone (/ aɪfoʊn / eye-fohn) is a line of smartphones designed and marketed by Apple Inc. It runs Apple's iOS mobile operating system, originally called "iPhone OS". The first iPhone was released on June 29, 2007; iPhone latest, sixth-generation iPhone 5, released on 21 September 2012. The user interface is built around a multi-touch screen devices, including a virtual keyboard rather than a physical one. The iPhone has Wi-Fi and cellular

The iPhone can record video (although this is not a standard feature until the iPhone 3GS), take photos, play music, send and receive emails, surf the web, send texts and receive visual voicemail. Other functions-games, reference, GPS navigation, social networking, etc.-can be activated by downloading applications, such as in 2012, the App Store offers more than 700,000 apps by Apple and third parties.

There are six generations of iPhone models, each accompanied by one of the six major release of iOS. Original iPhone is a GSM phone, and established design precedents, such as screen size and button placement that have persisted through all models. The iPhone 3G added 3G cellular network capabilities and A-GPS location. The iPhone 3GS added a faster processor and a high resolution camera that can record video at 480p. IPhone 4 displays high-resolution 960 × 640 "retina display", higher-resolution rear-facing camera and the low resolution front-facing camera for video calls and other applications The iPhone 4S adds 8. - Megapixel camera with 1080p video recording, dual-core processor, and a natural language voice control system called Siri. iPhone 5 features new A6 processor, holding a 4-inch Retina display that is larger than its predecessor 3.5-inch screen, and replace the 30-pin connector with lightning all-digital connector.

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