iOS 18
Run shortcuts with the Action button
On supported models (iPhone 15 Pro or later), iPhone has an Action button in place of the Ring/Silent switch. You can choose which function you want the Action button to perform when you press it, including running a shortcut.
Configure the Action button to run a shortcut
On supported models, go to Settings
> Action Button.An image of the side of the iPhone appears with icons representing actions you can assign to the Action button.
Swipe to Shortcut, tap Choose a Shortcut, then select a shortcut.