In the video, a person is holding two smartphones in their hands. The person is using the smartphone in their left hand to demonstrate how to change the wallpaper on the smartphone in their right hand. The person taps on the screen of the smartphone in their right hand, and a menu appears with different wallpaper options. The person scrolls through the options and selects a new wallpaper. The person then taps on the screen again to apply the new wallpaper. The video provides a clear demonstration of how to change the wallpaper on a smartphone.