You can't use it on a plane because no one wants to be forced to hear someone talk on the phone for an entire 2+ hour flight and we certainly dont want to hear people on planes talking over each other.
You could have a 'talkers' section like they used to have a smokers section.
a. Someone can do this now, they just have to pay the rates for in-flight phones.
b. If you're going to ban cell-phones on the basis of how much they annoy other passengers, you'll also have to ban babies.
I'm in!
Also, ear plugs work wonders. I never fly without them.