To delete a wallpaper on an iPhone running iOS 16 or later, follow these steps:

  1. Lock your phone by pressing the side button (newer iPhones) or the top button (older models).
  2. While on the Lock Screen or home screen, perform a long press anywhere on the screen.
  3. Navigate through the displayed wallpaper options by sliding your finger left or right.
  4. When you find the wallpaper you want to delete, swipe up on it, showing a red delete icon.
  5. Tap the delete icon (red circle with minus sign), confirm by selecting 'Delete This Wallpaper'.

Alternatively, directly from the Lock Screen wallpaper options while facing your selected wallpaper:

  1. Touch and hold the Lock Screen to open the wallpaper gallery if prompted.
  2. Swipe up on the wallpaper you wish to delete to reveal the option to remove it.

Keep in mind that these methods work for removing user-generated and system wallpapers accessible via the Lock Screen customization on recent iOS versions supporting interactive wallpaper editing.