Regular reader João Paulo has presented us with an interesting mystery to solve today.

If you briefly press the volume up and volume down buttons simultaneously 3 times in a row your phone will vibrate 3 times and then briefly flash the screen on and off.

No screen shots pop up in the photo collection, so that is not what’s going on, and a quick search does not turn up this combo mentioned anywhere else.

Interestingly the button combo also works in Windows 10 desktop, where pressing the volume up and down buttons briefly causes your PC to beep and flash the screen twice.

Do any of our readers have any idea what (probably blindingly obvious thing) going on? Let us know below.

Thanks João for the tip.