Question: what size are the iphone x?
Answer: Display. Super Retina XDR display. ... 
5.8-inch (diagonal) all-screen OLED Multi‑Touch display1 6.5-inch (diagonal) all-screen OLED Multi‑Touch display1 ... 
HDR display. HDR display. ... 
2436x1125-pixel resolution at 458 ppi. 2688x1242-pixel resolution at 458 ppi. ... 
2,000,000:1 contrast ratio (typical) 2,000,000:1 contrast ratio (typical)