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iPhone Duo guides
How to get wallpapers, widgets, icons and the Lock Screen right on a phone with two screens of different shapes. No fluff, no affiliate links, exact numbers where they matter.
iPhone Duo wallpaper size: the exact pixels for both screens
iPhone Duo cover screen is 1398×2034 and the inner screen is 1878×2670. The two aspect ratios are not identical — here is what that means for your wallpaper.
How to set a different wallpaper on each iPhone Duo screen
Step-by-step: how to give the iPhone Duo cover screen and inner screen their own wallpaper, and why a matched pair beats one stretched image.
Putting widgets on the iPhone Duo cover screen
How to add Home Screen and Lock Screen widgets to the 5.4-inch iPhone Duo cover display, and how to design widgets that work at that size.
How to change app icons on iPhone Duo
Custom app icons on iPhone Duo work through the Shortcuts app, the same way as on any iPhone. Here is the method, and its two real drawbacks.
iPhone Duo wallpaper looks cropped, zoomed or blurry — how to fix it
Three reasons an iPhone Duo wallpaper does not sit right: wrong aspect ratio, a file that is too small, and Perspective Zoom. Each with a fix.
iPhone Duo Lock Screen: clock, widgets and the depth effect
How to customise the iPhone Duo Lock Screen on both displays, and which wallpapers work with the depth effect and which do not.
Start here
If you only read one, read the wallpaper size guide — the two screens are not the same shape, and almost everything else follows from that.