An iOS 8 preference list file has been found with an iPhone resolution of 736×414, reports 9to5Mac, which would translate to a Retina “2X” screen resolution of 1472×828. At a 4.7” screen size, this would be around 359 pixels per inch (PPI), versus a 307 PPI resolution for 5.5” — the latter just enough pixel density to qualify as a Retina display. If displayed on a 4” screen, this would equal 422 PPI. Previously, 9to5Mac…