For excellent cell phone reception you may just want to turn to Cingular Wireless for your cellular service provider. Cingular is a very large network and have coverage where most service providers have not thought to go.
You can bundle your cingular plan with your bellsouth home telephone bill and get a monthly discount. Cingular has some good family plans that provide rollover minutes. If you don't use all of your minutes in a given month, they automatically rollover to the next month. I have many rollover minutes banked in my account.
The only thing I can find difficult about Cingular is one of the local stores has some very bad service. The lines are usually long and they move very slowly.
But the phone service is excellent. Check out this link and see if you can't find a much better plan here.