History of iPhone

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On October 17, 2007, in an open letter posted to Apple's "Hot News" weblog, Steve Jobs announced that a software development kit (SDK) would be made available to third-party developers in February 2008. The SDK was released on March 6, 2008, and allows developers to make applications for the iPhone and iPod Touch, as well as test them in an "iPhone simulator". However, loading an application onto the devices is only possible after paying an iPhone Developer Program fee, which is $99.00 USD per year. Since the release of Xcode 3.1, Xcode is the development environment for the iOS SDK. iPhone applications, like Mac OS X, are written in Objective-C,with some elements of an application able to be written in C or C++.

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