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How to hide photos on iPhone
Have some photos you'd rather no one else see? Hide them on your iPhone.
Perhaps you're not satisfied with simply hiding individual photos and you'd like to learn how to make and navigate hidden albums on your iPhone as well. Step 3: To set up Face ID to view your Hidden album, simply tap the toggle to green. Be that as it may, making use of the "Hide" iPhone feature for photos is still a great idea, because there's always the chance that someone looking through your phone doesn't know this information.
Or read this on Mashable