Wallpapers and lock screens aren't the only things you can change to give your iPhone some visual flair. You can also change the images that come up when people call you, known as call screens. Screen Builder offers a library of pre-made images and patterns to help you customize your iPhone's call screens. Doing this lets you change the image background. Using the image you create means replacing the photo in a person's address book entry. Add your face to images in Screen Builder.