The new iPhone 15 Pro and iPhone 15 Pro Max are equipped with a customizable action button that replaces the traditional silent switch on previous iPhones. By default, the button is set up to toggle between ringer and silent modes, but it can also be assigned to other actions for quick access to features like the camera, flashlight, voice memos, and more.
access:
Apple Online Store (China)
One of the options for the action button will be the Translate app, allowing you to quickly start translating between two languages without having to open the app. However, fine print on Apple’s official website states that the translation option will not be available for action buttons until later this year, which means it will be enabled in a future iOS 17 update.
Here's a quick look at the other options immediately available for action buttons:
Ringtone/Mute
focus
camera
flashlight
Voice memo
magnifier
shortcut
Accessibility
You must hold down the action button to initiate the assigned action.