Question: do any phones have 4k?
Answer: The Xperia XZ Premium's 5.5-inch display is the first smartphone screen to support both 4K and HDR tech. (Other phones have had one or the other, but not both.) The 4K support means it has a resolution of 3840 x 2160, which equates to a whopping 807 pixels per inch. ... But other phones are just as good.