Outside of the Moto X, hands-free voice commands on Android are limited; pick up a Nexus 5 or Galaxy S5 and youll find that OK Google only works at the home screen. If Android Polices sources are accurate, though, youll soon get to bark out orders no matter where you are in the interface. Google is reportedly trying out an OK Google everywhere feature (mocked up here) that, much like the Moto X, is always listening and responds only to your voice.