Use the "-" button to take stills while filming video on the iPhone

Added on by Bryan.

I noticed this on New Year’s Eve this year: if you’re taking a video on the iPhone, you can simultaneously take a still photo by pressing the “-” volume button on the side of the phone.

Pressing the “+” volume button will start/stop recording video.

(There’s also an onscreen button for doing these tasks, but when it comes to using the iPhone’s camera, nothing beats using the hardware shortcuts!)