It could be handy for a digital assitant to know when you're near the phone. You could use a particular motion to wake it for audio input rather than a button o

It could be handy for a digital assitant to know when you're near the phone. You could use a particular motion to wake it for audio input rather than a button or having the phone always listening for audio. You could possibly use it for presenting slides, or have it measure a piece of wood or string or fabric or a package for you.