Check with the folks over at Cricket Wireless in La Plaza Grande shopping center near Spanish Springs [near Publix].
We use it and have no probs from Maine to Florida - they use AT&T cell towers.
All prices include taxes and fees - nothing extra.
In addition to reviewing carrier coverage maps I have found this site pretty good for identifying the location of towers/antennas wherever we are...
AntennaSearch - Search for Cell Towers, Cell Reception, Hidden Antennas and more.
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Not sure if I have free time...or if I just forgot everything I was supposed to do!