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iPhone Generations
There are four generations of iPhone models, each accompanied by one of the four major releases of iOS (formerly iPhone OS).
The original iPhone was a GSM phone that established design precedents like screen size and button placement that have
persisted through all models. The iPhone 3G added 3G cellular network capabilities and A-GPS location.
The Phone 3GS added a compass, faster processor, and higher resolution camera, including video recording at 480p.
The iPhone 4 has a rear facing camera (720p video) and a front facing camera (at a lower resolution) for FaceTime video calling
and for use in other apps like Skype.
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Apple iPhone
The iPhone is a line of Internet and multimedia-enabled smartphones marketed by Apple and designed by Jonathan Ive. The first iPhone
was unveiled by former Apple CEO Steve Jobs on January 9, 2007, and released on June 29, 2007. The 5th generation iPhone is expected
to be globally released in Q3 2011 inline with the release of iOS 5.0, the Apple operating system for handheld devices.
An iPhone can function as a video camera (video recording was not a standard feature until the iPhone 3GS was released), a camera phone, a portable media player,
and an Internet client with email and web browsing capabilities, can send texts and receive visual voicemail, and has both Wi-Fi and 3G connectivity. The user
interface is built around the device's multi-touch screen, including a virtual keyboard rather than a physical one. Third-party as well as Apple application
software is available from the App Store, which launched in mid-2008 and now has over 425,000 "apps" approved by Apple. These apps have diverse functions,
including games, reference, GPS navigation, social networking, security and advertising for television shows, films, and celebrities.
The touchscreen is a 9 cm (3.5 in) liquid crystal display with scratch-resistant glass. The capacitive touchscreen is designed for a bare finger,
or multiple fingers for multi-touch sensing. The screens on the first three generations have a resolution of 320 × 480 (HVGA) at 163 ppi, while that
of iPhone 4 has a resolution of 640 × 960 at 326 ppi.
The touch and gesture features of the iPhone are based on technology originally developed by FingerWorks. Most gloves and styluses prevent the necessary
electrical conductivity; however, capacitive styli can be used with iPhone's finger-touch screen. The iPhone 3GS and later also feature a
fingerprint-resistant oleophobic coating.
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iPhone 2G
iPhone 3G
iPhone 3GS
iPhone 4
iPhone 4S
