My 2 cents:
I would not have a problem with a jammer in theaters. Frankly, if you are out and left the kids at home or with the babysitter, you should have let them know where you'd be. That way if there's an emergency, they can call the theater's direct line and a theater employee can come find you. Otherwise, there is no reason to have a cell phone in the theater. If people would just turn them on silent, I would not have a problem.
On the issue of very young children/infants. We seem to have a major problem with that here. I notice that more than I ever hear people on cells in the theaters. As far as I'm concerned, if you can't find a babysitter, don't go to the damn theater and ruin if for everyone else. I have 3 kids myself and I never go to a movie unless I have a sitter. That is, unless it's obviously a kids movie. I hate having to try to hear a movie over a baby crying. I will never understand how people can be so inconsiderate.
