Is it a good idea? I'm not so sure. At least if you're on a bus or train you can get up and move away from them and some trains have quiet carriages with a ban on mobile phones.
What if you're on a long haul flight and you end up sitting next to an insomniac weirdo who talks to his mother in Poughkeepsie? And she's a bit hard of hearing so he has to shout!
I wish I could fly.....