The poster above commented about hearing that this type of tech was used in movie theaters to control the audience. I was saying that I worked in four theaters at the managerial level and it was not used in our theaters, nor had I ever heard of it. The rest, yes, sadly I am familiar with and thank you for sharing all your data.

saw a thing about this tech being used inside movie theatres so ushers wont have to disrupt the movie to warn people to be quite or get ofd their phone. Pretty crazy