Believe it or not, I have no cell phone. I do not want to be found, thank you, when I'm out running errands. I can't stand listening to people yammer on - rarely are these important conversations. Just yak, yak, yak. If you have something to tell me, that's what the voice mail is for - on my land line phone.
My son (15) has a phone we buy minutes for - he can call me when he's ready to be picked up from school or a friend's house.
We use Sprint. DH and I both have the newest HTC EVO. Love the phone, not so crazy about the service. Sprint sold the cell tower by our house to AT&T and we have so many dropped calls. We are now roaming when we're at home too, but we have nationwide so at least we're not being charged crazy amounts for it.