Google Cardboard has the best use of QR codes I've seen recently - they convey the config for device. You scan it with your phone instead of having to enter the

Google Cardboard has the best use of QR codes I've seen recently - they convey the config for device. You scan it with your phone instead of having to enter the values by hand. Because they're printed on the device, you're not searching for those config details when you use it with a new phone six months later.