[Phone] How do I activate shortcuts when my screen is off?
When your screen is off you can double-press the volume button to swiftly use one of your selected shortcuts, such as Quick Shot to quickly take 3 photos, Record video, Open camera, or Open front camera.
Swipe down from the top of the screen to access Quick Settings > Tap the Settings icon > Advanced > Set the Screen off shortcut toggle to the “On” position and tap it > Then select Quick Shot.