Back tap is not exclusive to newer iPhone models as it does not require special hardware. Therefore the feature does work with iPhone 8 and newer models. iOS 14 is compatible with iPhone 6s and beyond, including the first-generation iPhone SE

first-generation iPhone SE

The first-generation iPhone SE (also known as iPhone SE 1 or iPhone SE 2016; SE is an initialism for Special Edition) is a smartphone that was designed, developed, and marketed by Apple Inc. It is part of the 9th generation of the iPhone alongside the higher-end iPhone 6S and 6S Plus.

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Is Backtap Available in iPhone 6s?

The answer to that is no, they do not support the back tap feature. Although iOS 14 is available for use for the iPhone SE, iPhone 6s, iPhone 7, and iPhone 7 Plus, these models aren't compatible with the newest functionality feature provided by Apple.

Does iPhone have Backtap?

Back Tap is available on iPhone 8 and later. Go to Settings > Accessibility > Touch > Back Tap. Choose Double Tap or Triple Tap, then choose an action. To perform the action you set, double-tap or triple-tap the back of iPhone.