A year after the release of the iPhone 3GS, Apple introduced the iPhone 4 in June 2010. This version is thinner than its predecessor (9, 3 mm vs. 12, 3 mm), more notably, this is the first iPhone owns the screen Retina (3.5-inch with a resolution of 960 x 640p, the density is 326 PPI). Those features include a 5MP camera there Assistant LED flash light, front VGA camera, an Apple A4 1 GHz speed multiplier unit, RAM 512 MB. All the new features Apple introduced accompanied slogan: "This changes everything. Again. "
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