The feature is called Back Tap and, like the Action Button on newer iPhones, it gives you one more way to use your device ...

Type in a few numbers and symbols on your dialer and discover powerful tools, system info, and settings buried deep in your phone.

Here’s exactly how to enable it and protect your data.

Whether it's a scrap of paper on the ground or a bystander that wandered into the family photo, the Photos app on iPhone, ...