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It should work on an iPhone 11 as long as you've upgraded to iOS 14. It's supported the iPhone 8 and newer: https://screenrant.com/apple-ios-14-back-tap-iphone-list/

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It uses the accelerometer that has already been built in to iPhones going way way back (actually ALL iPhones have at least a 3-axis accelerometer), so that's why there is so much support for older devices.

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