I'm avidly against phones interfering with any event that involves other people. Movies, dining, etc.
One of my big pet peeves is someone using their phone while out to dinner with a group, etc. The entire point of meeting for dinner is to spend time with one another. Texting during movies annoy me even more than texting while dining. Who cares if your phone is on silent, it's still a beacon of light in the middle of the theater. It's distracting to everyone else who paid to be there. If I had my way, you would get kicked out of a movie when an usher sees your phone screen lighting up.
I understand that there are emergencies and such that require immediate attention, but pending that, phones should be all but banned during movies.