Get the wallpapers into Photos
- Open a wallpaper full size, press and hold it, and tap Save to Photos.
- If they came as a zip, open it in the Files app and tap it to unzip. Open the folder, tap Select, select them all, then tap Share → Save Images.
Set up Photo Shuffle
- Press and hold the Lock Screen, then tap + to add a new wallpaper. You can also go to Settings → Wallpaper → Add New Wallpaper.
- Tap Photo Shuffle.
- Choose Select Photos Manually and pick the wallpapers you saved.
- Set Shuffle Frequency to On Tap, On Lock, Hourly or Daily.
- Tap Add, then Set as Wallpaper Pair.
Change how often it shuffles
Press and hold the Lock Screen, tap Customize, choose the Lock Screen, then tap the ⋯ button and pick a new Shuffle Frequency. On Lock changes the picture every time you wake the phone; Daily keeps one picture for the whole day.
Keep the clock readable
The clock and widgets sit over the top third of the Lock Screen. Wallpapers with a calm area at the top read best; a picture larger than the screen stays sharp — the biggest current iPhones are about 1320 × 2868. See the iPhone wallpaper size guide for each model.