The only time they really annoy me is when people leave their ringers on or answer them at inappropriate times. Like when you are in class at school, in a movie theater or other such event like a play or ballet, etc. When you are attending a lecture given by a speaker, during meetings, or when you are having a conversation with somebody. or when you are paying someone for their time or services and they are yapping on their cell phone on your dollar! I also work in retail, so I hate it when people are talking on their phones when checking out, it makes it to where they are not paying attention so it slows the line down for everyone else. Also when people are texting or talking while driving, you can't pay as good of attention to the road and you start driving all crazy, there are articles about scientific research done on the topic proving that your brain is not fully engaged in the task of driving while using your cell phone. Other than that, I think they are great. I defiantly think their should be like some etiquette rules for them though!