The reason apple will give support for 3 years of iPhone

Apple supports older devices for the sake of the ecosystem, uniform development, and app sales.

As soon as an older device becomes a hindrance to any of the aforementioned, and is no longer economically viable, it will get dropped.

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Steve Jobs, January 9th 2007, 10:44am: "We filed for over 200 patents for all the inventions in iPhone and we intend to protect them."

Source: http://forums.macrumors.com/showthread.php?t=1404207&goto=newpost

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