Open the Settings app
Tap Wallpaper
Select the wallpaper you want to remove
Tap Delete or Remove
Confirm the deletion
If the wallpaper is saved in Photos or Files, delete it from that app too
If the wallpaper is set on the lock screen or home screen, change it to another wallpaper first
On Android, press and hold the wallpaper on the home screen, then tap Wallpapers or Wallpaper settings
On iPhone, press and hold the lock screen, swipe to the wallpaper, then tap Delete
Empty the Recently Deleted folder if needed