One of the "last bastion's" of cell phone - free environments, was the underground portion of the New York City subway system. Then they started placing towers in the station's, along with wifi.
So now, people are using their cell phones aboard the trains...they lose the signal for a few seconds, and then reconnect again at the next station. Probably only a matter of time before they wire the tunnels, too. I think it is a good thing, in general for communication's to exist, for public safety, if nothing else.
Even the new city buses have free wifi, and USB charging ports.