Apple will reportedly release two versions of its next-generation iPhone featuring 4.7 and 5.5-inch sapphire screens in September, reports the South China Morning Post. Citing industry insiders who have "seen the prototypes," the publication also states that both phones will feature a pixel density of 441 pixels per inch (PPI) compared to the 326 PPI currently found on the displays of the iPhone 5s and iPhone 5c. Furthermore, the Chinese newspaper adds that the new devices will feature a flat screen instead of a curved screen as suggested b
