It can come in handy if my car breaks down, call AAA. Can check email on it (deduct 15 cents for each) etc. But I'm not chained to it and I can survive without it, say, if I go off to work and forgot the phone at home. (Just hope I don't break down.) No camera. Pretty much used to make occasional phone calls.
(My LG Virgin Mobile dumbphone):
(...I use a netbook with wifi when I travel, not the phone to surf web)