iPhone is a multimedia smartphone developed by Apple. It combines the functionality of the MP3-player, communicator, and internet tablet. It uses the iOS operating system, which is a simplified version of Mac OS X, optimized for working on a mobile device.
The first iPhone was announced by Steve Jobs at the conference MacWorld Expo on January 9 2007. It entered the market on 29 June 2007 together with the 1st generation iPod Touch and iPhone OS and has quickly gained a substantial market share of smartphones in the United States.
10 June 2008, a new model iPhone 3G was presented at the WWD. It was an improved model with numerous hardware and software problems fixed, which have been discovered in the forerunner. It was equipped with the new iPhone OS 2.0 version and the U.S. contract version was cheaper.
8 June 2009, the third model appeared, which was an improved version of the iPhone 3G. Titled iPhone 3GS, it had a double amount of RAM, increased CPU speed, and was available in a configuration with 32 GB of internal memory, equipped with OS iPhone OS 3.0. A significant portion of previous models bugs were fixed and new software provided additional functions: copy and paste, the ability to send MMS, forwarding / deleting SMS, Spotlight, Speak Notes, Find My iPhone, the ability to download TV shows, music videos, movies, and audio books directly to iPhone, and many others.
7 June 2010, iPhone 4, equipped with new iPhone OS (re-titled in iOS), was presented. It had a number of advantages over previous models, including more powerful central processor Apple A4, LCD with IPS matrix with resolulion 640 × 960 pixels, 5 MP camera, and was equipped with additional front camera for video calls (0.3 MP).
4 October 2011, iPhone 4S with iOS, hit the market (the next day, 5 October 2011, Steve Jobs died). New iPhone had the same processor as iPad 2, 8 MP camera and a hybrid GSM / CDMA communication systems. In new smartphone Voice Control was replaced with voice assistant Siri, available only in the iPhone 4S.
19 September 2012, the company introduced new iPhone 5. This model has gained a larger screen (with 4 inches screen compared to 3.5 inches in all previous versions), which was the most significant change in appearance from the beginning of its production.
As of July 2012, total amount of sold iPhones is more than 250 million.
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