Cingular, ATTWS, TDMA, and GSM
Cingular owns ATTWS's TDMA network, which isn't much used anymore as they won't take new subscribers to it, they're just supporting the legacy customers because it doesn't cost much to run and they make a lot of money per user (more than they do for GSM customers because the rates haven't changed in years). In fact, they just issued a $5-10 surcharge to TDMA customers.
Cingular originally partly grew out of Bellsouth's cell network which was also (I believe) TDMA, so they may have some legacy towers, as well, but Bellsouth's cell service was TERRIBLE here, easily the worst we've ever had. I had a friend that lived in Southern Trace that got 6 or 7 hundred dollars worth of roaming charges one month from using his phone at home.
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