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Black wallpapers behave differently on an OLED panel. Here is what pure black does for battery, contrast and legibility, and how to pick a dark wallpaper that still has depth.

The cover screen and the inner display of the iPhone Duo have different shapes and different purposes. Here is how a matched Cover and Inner wallpaper pair is designed, cropped and set.

Exact iPhone Duo wallpaper sizes for both displays: the 1398 × 2034 px cover screen and the 2670 × 1878 px inner display, plus aspect ratios and file formats.

A folding phone hides parts of the display behind a camera cutout and reserves space for the clock. Here is how to place a wallpaper so the subject is never lost behind the hardware.

iOS animates wallpapers through Live Photos, not video files. Here is how to turn an MP4 loop into a Live Photo and set it on the cover or inner display of the iPhone Duo.

The same photo can look perfect in one app and ruined as a wallpaper. Here is what the phone does to your image, why the subject ends up cut off, and how to prepare a file that survives the crop.