Here's what I think. If I am in a public place I carry on publicly acceptable conversations with friends. I don't really want to have a private conversation in a place where others can hear me, like on a bus or in a store. The problem I find, is that some people on cell phones think that because they are on a phone, they can carry on private conversations or business calls. This is annoying to me because I don't want to hear about their dramatic lives, or how much money someone is looking to get. Something about cell phones give their owners a sense of being in a separate world. Not quite in the world around them. That is quite annoying.
Cell phones on trains, buses and the like