iPhone wallpaper

Hey there, and welcome to Apple Support Communities Masamaly,

We can certainly understand your concern and can help provide some insight.

You might need to set the wallpaper again in order to remove the black background. We recommend checking out these steps for more information on how change your wallpaper.

" Add a new wallpaper for your Lock Screen or Home Screen

1. In the Settings app, tap Wallpaper.
2. Tap Add New Wallpaper.
3. Tap Photos, People, or Photo Shuffle to choose your own photo. You can also select a wallpaper from a category like Weather & Astronomy, Emoji, Collections, or Color.

4. If you want, you can customize your wallpaper further. Then tap Add.

Change your wallpaper from the Lock Screen

1. Make sure that you previously set up Face ID on your iPhone. To change your wallpaper from the Lock Screen, Face ID must clearly see your eyes and the areas around them.
2. On the Lock Screen, touch and hold your Lock Screen to open your wallpaper gallery.
3. To select a wallpaper you already created, swipe left and right. To add a new wallpaper, tap the Add button .

From the Lock Screen wallpaper options, you can also tap the Focus button to link a Focus to a specific wallpaper, customize existing wallpapers, or swipe up on a wallpaper and tap to delete it.

If you can't use Face ID to change your Lock Screen, touch and hold your Lock Screen until the Customize button appears. If the Customize button doesn’t appear, touch and hold the Lock Screen again, then enter your passcode. "

For additional information, check out this link: Change the wallpaper on your iPhone - Apple Support

These steps will help ensure your device is working with ease and can fix common issues like the ones you’re experiencing.

Kindest regards!