Here is another blurb from IMDB.com:
A survey conducted for Cingular Wireless indicates that talking on a cell phone in movie theaters is the number-one peeve of moviegoers. An overwhelming 73 percent of those polled called the behavior the most annoying, with chatting with a seatmate and hearing a cell phone ring during a movie ranking well behind with 10 percent each. Nearly one third of the respondents admitted that they had been embarrassed when their own cell phones went off during a movie and 93 percent urged theater owners to post an on-screen message reminding people to turn off their cell phones off before the movie begins.
Sadly, even if I leave my cell phone on, I never get any phone calls while watching a movie in the theater. Maybe its because usually the people that would call me are sitting right next to me. Or maybe I’m just trying to make myself feel better.