Knock code is brilliant as well.

Having knock on and knock code at the same time causes a delay and the phone doesn't know which knock to register (I just stopped using knock code)

The phone also has a good array of features, such as knock-knock, knock code, quick access to the camera by volume button, and so much more.

Also, you can knock a code on the phone to log into it, which is really neat and convenient, but it doesn't always register, so it can get frustrating at times

I like the knock code feature