When the iPhone came out in 2007, it totally transformed the mobile industry. But what was so revolutionary about the software in even its first version? For the 15th anniversary of the announcement of the iPhone we talk about the three aspects of the original iPhone's software that set it apart from the smartphones that came before it: its robust operating system, its multi-touch user interface, and the App Store, which arrived 1 year later. We note that it wasn't necessarily the first in all of these categories, but explain why it was the most significant.
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