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Run shortcuts by tapping the back of your iPhone
The Back Tap Accessibility action lets you run a shortcut when you double-tap or triple-tap the back of your phone. See Adjust touch settings on iPhone. If you need to pass items on your device’s screen to your shortcut, see Receive on-screen items from other apps.
On your iPhone, go to Settings
> Accessibility > Touch.
Scroll down, then select Back Tap.
Select either Double Tap or Triple Tap.
Scroll down to the Shortcuts area, then choose a shortcut.
Tap Back Tap to apply the setting.
Double-tap or triple-tap the back of your phone to run the shortcut.