Here’s Why iPhone 5 Features a 4-Inch Display

Back in 2007, Apple introduced the original iPhone with a 3.5 inch screen and continued that size for four further generations of the device.
There was obviously a lot of research that went into arriving at a size of 3.5 inches diagonally, including usability considerations, pixel density, screen resolution and a lot more. But why did Apple move to a 4-inch screen with the iPhone 5 if there was so much research backing up the 3.5 inch screen size?
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