How do you make an animated gif your cell phone background?

To set an animated GIF as your cell phone background, first save the GIF to your device. On Android, you can use a third-party app like "GIF Live Wallpaper" to set it as your wallpaper. For iphones, you can use the "Live Photo" feature by converting the GIF to a Live Photo format and then setting it as your wallpaper in the Photos app. Remember that not all phones support animated wallpapers, so check your device's capabilities.