I agree with the caller above about T-Mobile. Free basic phone which will be nicer than the one you have, all their plans have nationwide so there is no roaming, and they have excellent customer service.

For example, I recently dropped my phone in some water. I did not have insurance. But because I'd been with them for more than a year and always paid my bills on time they gave me a phone at the price I would have paid at sign up. Very nice phone for very cheap and it was my mistake!