Q&A for How to Change the Background on an iPhone

Go into your Settings and tap on General followed by Accessibility. Then, scroll to the bottom and find Accessibility Shortcuts. Tap "Color Filters" so that a check mark appears beside the option. Now when you triple tap your Home button, your iPhone screen will display in black and white.

Settings -> Wallpaper -> Add New Wallpaper -> select what you want to do from there, such as import photo or use a preset from Apple.

Go into the settings app and click Wallpaper. Find your original Wallpaper and delete it.

If you click settings and click Wallpaper, when you select one it should give you the option to apply the wallpaper to lock screen and home screen, just home screen, or just lock screen.

Open your Settings app, click Wallpaper, and then select a photo or provided Wallpapers. When you click your chosen Wallpaper, you'll get the option to apply it to both the lock screen and the home screen, just the home screen, or just the lock screen.

To get a pure white background on your iPhone, download a white image from the internet and set it as your wallpaper. Currently, Apple does not offer a built-in pure white background option.

Tap on the book you are reading. Once on the page, you should see an icon in the bottom right. Tap on it and select "Themes & Settings." The option to turn the screen to black (or back to white) is in the top row on the far right, shown as a circle that is half white and half black.