I live in NYC and it's been a problem here for at least 10 years. I can't tell you the number of times I've had people near me talking on their cell phone ("Yeah, I'm watching this movie and it sucks. What are you doing ?"). Texting is extremely common. If you sit toward the back on can see the glow of a half dozen smartphone screens at any given time (or more). Having them constantly light up in your field of vision is a annoyance. It's so bad that I basically don't go to movies anymore.