Back Tap on iPhone
Updated: Nov 24, 2020
Update 11/24/2020: I have learned from a subscriber that not all phones able to run iOS 14 also have Back Tap capability. Here's the list of phones that should support Back Tap: iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone 12 Models. Personal experience confirms iPhone 8 and iPhone XS support Back Tap.
Back Tap is available only on the iPhone and requires software version 14 . To determine your software version, go to Settings, then General, then Software Update, to see if version 14 is installed.
On the iPhone, go to Settings, Accessibility, Touch. Scroll to the bottom and find Back Tap. If you have not activated the feature, it displays Off. Tap and you'll see a screen showing Double and Triple tap options. Tap your desired option (Double Tap or Triple Tap) and on the next screen, scroll and tap your desired action. You can change the setup anytime, or you can deactivate Back Tap by choosing None for both Double and Triple tap.
I use Double Tap to take a screenshot of my phone. I left Triple tap unassigned. Surprisingly, Back Tap works for me, even though my phone case covers the back of the phone. You may or may not have similar success - depends on the case.