With Apple’s latest update (iOS 14) many iPhones now have an extra (hidden) button called Back Tap.
Features
With Back Tap you can have your iPhone call an emergency contact, take a screenshot or run one of your iOS Shortcuts all by simply double or triple tapping the back of your iPhone.

Setup
Enabling Back Tap is simple. Go to Settings > Accessibility > Touch > Back Tap

Once in the Back Tap settings you’ll be able to choose from an array of options from taking screenshots, scrolling up, scrolling down, and even running Shortcuts for both double and triple tap. This makes using larger phones with one hand incredibly easy. Check out our article on the iPhone 12 Pro Max’s screen size.
As you can see Back Tap works absolutely fine with Apple’s new iPhone Case with MagSafe and wallet attached. Checkout the latest MagSafe accessories from Apple below: