If you have an iPhone 8 black, it would be a good idea to download a high-quality black background wallpaper to decorate your screen. This will give your screen a sparkling look and add beauty to your device. The following tips will help you find the best iPhone backgrounds. The first step is to find out what your screen resolution is. You can do this with a simple table or with a program such as Adobe Photoshop or Pixelmator Pro. There are many ways to find the perfect iPhone wallpaper, but the most common way is to use a template.