Upgraded to iOS 16

First off, if you haven’t upgraded to iOS 16, go to Settings > General > Software Update > Download and Install

It is available for iPhone 8 and upwards. Back to the hidden features:

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Mark messages as unread

Swipe right on a message to mark a message as unread.

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10 New Features in iOS 16 You Should Know About

What's new in iOS 16: mark messages as unread, battery percentage, duplicate photo removal, haptic keyboard, and more