Found this, and hope it helps!!
Cheers,
Dave
https://www.businessinsider.com/how-to-set-up-back-tap-shortcuts-on-iphone
How to set up Back Tap shortcuts on your iPhone, so you can open apps just by
tapping the back of your phone
Dave Johnson
Sep 25, 2020, 5:41 PM
Tapping the back of your iPhone can do all sorts of things.
REUTERS/David Gray
To set up a Back Tap shortcut on your iPhone, you just need to head to the
Accessibility section of your Settings app.
Back Tap shortcuts let you quickly tap the back of your phone to perform
certain actions, which can be customized in many ways.
You can use Back Tap shortcuts on most new iPhone models, including all iPhone
8, iPhone X, and iPhone 11 models.
Visit Business Insider's Tech Reference library for more stories.
iOS 14 has given iPhone users a new way to interact with their phones: Back Tap
shortcuts.
Back Tap is a feature that lets users tap the back of their iPhone to launch
Siri, take screenshots, lock the phone, and more. This might sound like it's
prone to error, but it's actually quite consistent.
There are more than two dozen shortcuts you can assign to the Back Tap. You can
even connect a shortcut you've set up using the separate Shortcuts app.
That said, you can only have two Back Tap shortcuts at once — one for
double-tapping, and one for triple-tapping. But they're easy to set up and
change at any time.
Note that Back Taps aren't available on all iPhones. To use them, you'll need
to have one of these iPhone models
iPhone 8
iPhone 8 Plus
iPhone X
iPhone XS
iPhone XS Max
iPhone XR
iPhone 11
iPhone 11 Pro
iPhone 11 Pro Max
How to set up Back Tap shortcuts on your iPhone
1. Start the Settings app and tap "Accessibility."
Start by tapping "Accessibility" in the Settings app.
Dave Johnson/Business Insider
2. In the Physical and Motor section, tap "Touch."
3. Scroll to the bottom and tap "Back Tap."
Back Tap is a new entry in the Touch menu.
Dave Johnson/Business Insider
4. Tap either "Double Tap" or "Triple Tap," depending upon which gesture you
want to configure.
5. Choose the feature, command, or shortcut you want to assign to the gesture.
If you've set something up in advance using the Shortcuts app, it'll be listed
at the very bottom of the page under "Shortcuts."
You have a lot of choices to assign to the Back Tap gesture.
Dave Johnson/Business Insider
6. Tap "Back Tap" at the top-left to save your shortcut. You can now assign a
command to the other gesture, or stop here.
If you find that your Back Tap commands aren't working, even after you set them
up, check your phone case. Some phone cases — especially if they're thick —
will block your iPhone from picking up your taps.
Related coverage from Tech Reference:
You can use text-to-speech in the Kindle app on an iPad using an accessibility
feature — here's how to turn it on
How to use the Magnifier on your iPhone to zoom into hard-to-see signs and text
How to lower the brightness on your iPad even more than its usual lowest setting
How to enable LED flash notifications on your iPhone, for visual notifications
using Accessibility features
How to zoom in or out in any app on an iPhone using Accessibility features
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