4. The Apple Icon can be used as a button
Did you know that you can turn your Apple icon into an actual button? This is one of the ultimate hidden iPhone features and not that many users know about it.
This is called Back Tap and it gives you the opportunity to turn it into a shortcut to almost whatever you want, from the flashlight, to screenshot and to the magnifier tool.
To turn the icon into a button, go to Settings>Accessibility>Touch and tap Back Tap. After doing that, you will be asked whether you want to double-tap or triple-tap the back of your smartphone to activate the function that you have selected previously.