Nokia Lumia 830 - Double tap screen to wake up

A very useful feature is the ability to double tap your phone’s screen to wake it up. This may not work on all devices.

To enable this feature, go to Settings – Touch (this should be down the bottom). It could also be called Motion Launch.

Then change the option labelled Wake Up to On. Now when your phone is on standby, you can simply double press the screen to wake it up.