There have been 15 different iPhones, from the first one that went on sale on this day back in 2007 to the iPhone 7 and 7 Plus last year.
Between 2010 and 2015, Apple followed a consistent ‘tick-tock’ pattern: a new design one year, and new internals plus additional features the following year. For example, the iPhone 4 – a radical new design at the time – was released in 2010, while the following year saw the iPhone 4s. The 4s offered some worthwhile hardware upgrades (including an 8MP camera capable of 1080p video) along with Siri …
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