I work at a tech firm. We use these tools fairly regularly. Often, someone will ask a question the other person doesn't know the answer and will turn around and ask their phone. Works pretty good much of the time.
I'm still not sure how useful the frames will be, but I can see a few uses for them, especially on my daily commute.
I hear both occasionally being shouted out from TV and radio commercials at any nearby devices. I have no idea if that actually activates the devices in people's homes though. It seems like it would be extremely invasive if it does (which I realize might be not matter much to people who install that stuff in their homes in the first place)
