Cell phones have been compared to pacifiers for adults. They make people think they are connected to a vital source of informational nourishment. It seems to me that the most insecure and/or boastful people are the ones who are most loud and ostentatious about using their cell phones.
Nevertheless, ownership of a cell phone does not include a license to be rude. Do not whip out your cell phone in a restaurant, at a party, on the train, or in any situation in which the call inflicts your half of the conversation on those around you. If you are going into a business meeting and are not expecting a genuinely urgent call, turn off the cell phone. The same goes for the theater, a museum, and other places where the ringing of a phone would be unwelcome. Some restaurants now require patrons to leave their cell phones with the maître d’ and will inform you if you get a call.