The iPhone OS was introduced at the Macworld Conference & Expo on January 9, 2007, as the primary operating system of the iPhone, which was released in June of that year.[4] Initially, Apple had no plans to release a software development kit (SDK) for the OS,[5] which meant the only third-party applications with official support were web applications.
The OS had no official name until March 6, 2008, when the first beta version of the iPhone SDK was released. Before then, Apple marketing literature simply said that the "iPhone uses OS X".[6]
As of April 8, 2010 (2010 -04-08)[update], there were more than 185,000 applications available for the iPhone OS with over four billion downloads.[7] The 4.0 edition announced in April 2010 introduced multitasking as well as a slew of business-oriented features, including encryption for email and attachments.
http://en.wikipedia.org/wiki/IPhone_OS
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