I read recently that cell phone jamming is on the rise and I’m not surprised. People have gotten totally beyond rude with the way they use cellphones. They’re very often completely inconsiderate of the people around them that really DON’T want to hear half of their phone conversation (never mind all of it!).
These things have pretty sensitive microphones on them and can pick up very low speech. There’s no reason that anyone needs to get all loud and obnoxious with the things. Funny, they wouldn’t do that if they were using a old style hardwired phone.