Though most devices come with a default picture, users can usually change it to custom files of their choosing.Ī mobile wallpaper is a computer wallpaper sized to fit a mobile device such as a mobile phone, personal digital assistant or digital audio player. On a computer it is usually for the desktop, while on a mobile phone it is usually the background for the 'home' or 'idle' screen. A wallpaper or background (also known as a desktop wallpaper, desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, mobile communications device or other electronic device.