In general, it seems that the resolution of the iPhone wallpaper has been increasing over time. For example, the iPhone 6 has a lower resolution than the iPhone XS Max, which was released several years later. This trend will likely continue as newer models of the iPhone are released with higher resolutions and larger screens.

Winner: Apple iPhone XS Max. Display Its 2,688 x 1,242-pixel resolution is not quite as sharp as the 2,960 x 1,440-pixel resolution on the 6.3-inch P-OLED Pixel 3 XL, but it is bigger and both

Returns to modern times. I have iPhone XR. I need to set smaller interface as I can. My iOS is 15.6, so I can use only 13 Pro Max resolution. iPhone XR scaling factor is 2x. 13 Pro Max resolution in points is 428x926. And I need to apply 856x1852 in ResSet. I did it and get beautifully scaled interface from 13 Pro max on my Xr.
On the other hand, the iPhone XS Max also has an HD resolution but with (2436 x 1125) pixels. Moreover, the iPhone XR also has a pixel density of 326 PPI. Meanwhile, the iPhone XS Max has a pixel density of 458 PPI. Consequently, the iPhone XS Max display is more detailed and sharper than that of the iPhone XR.
There are a lot of possible screen sizes for the iPhone. AppleInsider shows you exactly the size of the iPhone XS, iPhone XS Max, and iPhone XR — and how they compare to other recent models.
5.8 inches, 84.4 cm 2 (~82.9% screen-to-body ratio) Resolution: 1125 x 2436 pixels, 19.5:9 ratio (~458 ppi density) Apple iPhone XS Max; Apple iPhone 8 Plus; Apple iPhone SE (2020) More 5wPwshE. 455 312 366 349 491 256 189 340 474

iphone xs max display resolution