Four years ago today, Apple released the original iPhone. The hype that preceded the release of the so-called “Jesus Phone” was nothing short of staggering. In four years, the iPhone has utterly transformed the mobile industry. One can debate how much Apple innovated versus refined when it comes to certain features (touchscreens and app stores existed before the iPhone), but when we look at the mobile industry, there is a very clear line between what happened before June 29, 2007, and what happened after.

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