To hear you say Alexa, or Siri, or any other assistant, it has to listen in the first place. That's the very principle of this feature.Yes I have an iPhone. Hopefully it is not listening while it is locked. And it should only "listen" when I speak into the microphone to call somebody. It would be illegal in my country to have it listening all the time. If you have -say- Alexa, which I don't, you volunteer to be monitored, but only after you call Alexa to activate every single use.