Having more cell phones everywhere also means seeing more people using them, in the street, in restaurants, in parks, and so on. It can get very annoying when all you hear is people talking on the phone, often quite loudly, especially in places where almost everyone has a cell phone like Europe and Asia. That's why in Taiwan, LG and the government decided to launch a campaign to teach people about Mobiquette, or the art of not annoying others with your cell phone.
Mobile etiquette is something that is becoming more and more important. While some people are trying, others have no problem being annoying by answering their cell phone during business meetings, in school or in theatres. The truth is one of two things will happen, either these people will need to become more responsible, or we'll see more places banning cell phones. There are already technologies used to block cell phone signals, and the last thing we need is for this to become a popular thing because a few people can't behave in public.