virgin mobile (and surprise, i'm in my mid-30s).
phone is some generic audiovox camera clamshell.
grand total: 20 bucks... every three months!
sidekick 3 w/ [the only carrier that has it. and i do enjoy its services and voice quality(whereas cingular has horrible voice quality)(at least where i live)] t-mobile
The down side to cell phones. Where I live I know people with all different services. I have Cingular which is the best, Verizon is ok, and when my best friend who has T-Mobile calls, I don't eve nanswer because the call is barely audible and gets dropped in about 10 seconds. We mostly text instead.