During the first Les Miz revival, two girls in front of me were texting and I asked them to stop twice. Then after the show I took out my phone and saw that not only had I left it on, but I had left the ringer on loud. I sure would have looked like a jerk if my phone had rang.
At another show I had purchased my phone earlier in the day and I had not yet figured out how to turn it off so there was a moment of panic when the lights went down, so I just took the battery out.
I have always been that guy, the guy who always asks people to stop talking/put away their phones at theaters, but lately, I have been feeling hopeless about it. More people are taking out phones just for a few seconds: to check the time, check why the phone is vibrating, etc. then they put it away again. Yes of course this is still wrong, but I never confront these people.
I cherish ushers who are especially aggressive about cellphones. I love hearing people complain about rude ushers. I love when ushers walk around and tell people to turn their phones off, a few rows at a time, and then shine a light at the phones that are still on.