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Don't tell anyone about this under any circumstances
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There is a hidden button inside the Apple logo on the back of the iPhone
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If I tap it twice it turns on the flashlight. If I tap it three times it turns on the camera
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To turn it on, open Settings. Move to Accessibility. Scroll down and pick Touch
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At the bottom of the screen you can find Back Tap. Here you can set up what happens when you double and triple tap the iPhone's logo
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Show the video to your friends to shock them