Cell phones can be convienient but they can sometimes be a pain.
The thing I dislike most is those people who yak-yak away on their phones, oblivious to their surroundings until they nearly hit you with their shopping cart or run over you with their car...and some of them have the nerve to look at you as if it was your fault!
I do have to wonder what the consequence of the global spread of cellular phones will be to the human race, in about ten or twenty years, after having half of your skull bombarded by high-frequency microwave radiation.