How often do you change mobile phones?

I feel because of cheap communication system introduced through mobile phones, people tend to concentrate less and less on their jobs, and most of the people are indulging in meaningful conversations. I go to a shop, owner is busy talking on mobile, I see a cab driver speaking on phone. I go to offices for enquiry, thery are busy chit chatting with their dearest ones. A decade ago situation was not like this. I know mobile has helped people in communicating faster, but then it also comes with all these problems. Look at the amount of money the mobile companies are churning out just on the basis of people's talk - useful, useless, meaningful.