This might be the best iPhone feature you never knew existed — from fastcompany.com by Doug Aamoth
Why doesn’t ‘Back Tap’ have its own ad? Or billboards? It’s amazing! And there are counterparts available for Android, too.

Excerpt (emphasis DSC):

Did you know that you could tap the back of your phone to make it quick-launch apps, settings, and shortcuts?

Although I feel mild shame for not knowing such a feature existed until now, I feel even greater joy that it’s part of my life. It’s life-changing, friends. Here’s how it works on an iPhone—and two ways to get something similar on an Android phone.