The iPhone is a line of Internet and multimedia-enabled smartphones marketed by Apple Inc. 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 500,000 “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.
Generations of iPhone
There are five generations of iPhone models, each accompanied by one of the five major releases of iOS (formerly iPhone OS). The first 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 iPhone 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. The iPhone 4 featured a higher-resolution 960×640 display; it was released on June 24, 2010. In the U.S., AT&T was the only authorized carrier until February 10, 2011, when a CDMA version of the iPhone 4 launched for Verizon. On October 4, 2011, Apple announced the iPhone 4S.
The iPhone 4S, announced on October 4, 2011 and released on October 14, 2011, added a higher resolution camera (8 megapixel) with 1080p video recording, face detection, and video stabilization, a faster, dual core processor, multi-standard wireless support (allowing a single handset to operate on networks based on both GSM/UMTS and CDMA technologies), GLONASS support and a natural language voice control system called Siri.
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