To replace a wallpaper in iphone, you don’t need to delete it. Instead, you can customize it directly by following these steps:

1. Tap and hold on your lock screen until the wallpaper selection screen appears.

2. Swipe to the wallpaper you want to replace and tap "Customize."

3. Use the options provided (Photos, Emoji, Weather, etc.) to select or create a new wallpaper.

4. After customizing, tap “Done” to apply the new wallpaper.

If you want to know how to delete a wallpaper on iphone then read the blog.