A curious question about my iPhone 6S's home button

Hey guys,
So, as I said, I received my iPhone as a Christmas present, but I've discovered something strange.
So, the curious thing that happens, is if you double tap your home button, lightly, without clicking it, just tapping it, there's this weird whooshing sound, like a car driving by really fast. Is this just Touch ID saying it's not necessary, or is it doing something? Thanks.



Oh so that's what it is. Thanks.


Hi! If you lightly touch your home button twice, it activates a feature called Reachability, where whatever is at the top of the screen is moved further down so that you can reach it with one hand: the whoosh sound indicates that this has happened. Reachability is switched on by default, but it can be turned off in Settings.