History From "OS X" To "iOS7" - Apple Inc.

Introduction -

Apple marketing literature simply stated that their iPhone runs a version of "OS X". When introduced, it was named iPhone OS. It was renamed iOS on June 7, 2010, as iPhone was no longer the only device to run iOS. Apple licensed the "iOS" trademark from Cisco.

Apple Inc. provides updates to the iOS operating system for the iPhone, iPad, and iPod Touch through iTunes, and since iOS 5.0, also through over-the-air software updates.

iPhone OS 1.x

First iteration of Apple's touch-centric mobile operating system. No official name given on its initial release; Apple marketing literature simply stating the iPhone runs a version of Apple's desktop operating system, OS X. On March 6, 2008, with the release of the iPhone software development kit (iPhone SDK), Apple named it iPhone OS.

iPhone OS 2.x

2.0, the second major release of the iOS, became available with the release of the iPhone 3G. Devices running 1.x are upgradable to this version. This version of the OS introduces the App Store, making third-party applications available to the iPhone and iPod Touch.

 iPhone OS 3.x

3.0 became available with the iPhone 3GS. It was released on June 17, 2009. This release added features such as copy and paste, and MMS. Not all features were available on the original iPhone. Devices running 2.x were upgradeable to this firmware.

iOS 4.x

iOS 4 was made available to the public for the iPhone and iPod Touch on June 21, 2010, and is the first release to be renamed to simply "iOS". This is the first major iOS release to drop support for some devices. It is also the first major iOS release that iPod Touch users do not have to pay for.
The iPhone 3G and iPod Touch (2nd generation) have limited features, including lack of multitasking capabilities and the ability to set a home screen wallpaper. While the iPhone 4, iPhone 3GS, iPod Touch (3rd & 4th generation) have all features enabled, such as multitasking. The iPhone and iPod Touch (1st generation) cannot run iOS 4.0 and above. iOS 4.2.1, released November 22, 2010, added iPad compatibility. It also was the last version to support iPhone 3G and iPod Touch (2nd generation, MB & MC model).

iOS 5.x

iOS 5 was previewed to the public on June 6, 2011. It was released for iPhone 3GS, iPhone 4 (GSM and CDMA), iPhone 4S, iPod Touch (3rd & 4th generation), iPad, and iPad 2 on October 12, 2011.
iOS 5.1.1 is the final release supported for the iPad (1st generation) and iPod Touch (3rd generation).

 iOS 6.x

iOS 6 was announced and previewed on June 11, 2012 during Apple Worldwide Developers Conference (WWDC) 2012, and its release was stated as Fall 2012. Following the pattern of previous iOS releases, some older devices were no longer supported, specifically the iPod Touch (3rd generation), and the iPad (1st generation). Supported devices include the iPhone 3GS and later; the iPod Touch (4th generation) and later; and the iPad 2 and later.
On September 12, 2012 at San Francisco's Yerba Buena Center for the Arts, among other items unveiled, Apple announced three iOS-related items: the next generation iPhone 5, the redesigned iPod Touch (5th generation), and the announcement of the release of iOS 6.0 the following week.
iOS 6 was released to the public on September 19, 2012, through iTunes and over-the-air updates.
iOS 6.1.3 is the final release supported for the iPod Touch (4th generation) and iPhone 3GS.

 iOS 7.x

 Apple announced iOS 7 on June 10, 2013 at its annual Apple Worldwide Developers Conference (WWDC) event, with release announced for sometime in the Fall (Northern Hemisphere) or Spring (Southern Hemisphere) 2013. At their iPhone event on September 10, 2013, Apple announced the full release of iOS 7 for September 18, 2013, while also unveiling two new iPhone models: the iPhone 5C and iPhone 5S. With this release, support was dropped for the iPhone 3GS and the iPod Touch (4th generation). Supported devices on this release include the iPhone 4 onwards, iPod Touch (5th generation), the iPad 2 onwards, and the iPad Mini (1st generation) onwards.

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