Well, what exactly are you defending against? Echo, like phones, uses low-power, always-on algorithms to listen for a specific phrase. Only when it hears that

Well, what exactly are you defending against? Echo, like phones, uses low-power, always-on algorithms to listen for a specific phrase. Only when it hears that phrase does it actually start recording and sending your audio back home. Are you worried about that low-power, always-on part listening to you? If so, then avoiding the Echo while carrying a phone with the feature switched off is sensible. But I don’t see why this would be worth worrying about, since the data stays local and isn’t saved. If you’re worried about the device secretly recording you and sending that data to someone else, then the two are equivalent in their threats.