This is the iPhone 7 Plus in red, but there's also a red iPhone 7 available . iPhone 7 specs. Weight: 138g Dimensions: 138.3 x 67.1 x 7.1mm OS: iOS 12 Screen size: 4.7-inch Resolution: 750 x 1334 Before looking, do you know the display size of the original iPhone? iPhone 7 Plus display? 5.5-inch – 1920 x 1080 resolution – 401 ppi – 625 nits – Retina HD LED-backlit LCD. Compare features and technical specifications for the iPhone 7 Plus, iPhone 13, and many more. 6.7-inch (diagonal) all-screen OLED Size and Weight 9. xSmPs8.