[squarefoot]

"Both an amazon echo and an android phone require a key phrase to activate."

But thanks to the devices closed nature, their manufacturers have the exclusive ability to remotely modify their workings so that the device could listen without the "owner" consent. This assuming it hasn't already been done and a single packet hidden into an update push can trigger undetectable monitoring. Technically it would be trivial to implement and trivial to turn off with another update so that it would remain undetectable in case of device hardware/firmware/software inspection.

SmartTV also should be treated as dangerous. https://bgr.com/2017/02/07/vizio-smart-tv-spying-case/ https://www.rte.ie/news/technology/2017/0308/858060-samsung-...