Being a world tri-band phone (regarding GSM frequencies), and not a US tri-band phone, it lacks the 850 mHz band and replaces it with the 900 mHz. Almost all Cingular--and many former AT&T--towers utilize the 850 mHz band. The few towers that do push out at 1900 mhz are too few and far between for you.
The answer? Either move to a different part of the US with solid 3G access through Cingular (or even better, to a different country, you Texan!), or get a new phone, either US-dual (850/1900), US-tri (850/1800/1900), or a quad-band (850/900/1800/1900). Or keep the phone and wait until Cingular beefs up its 3G (CDMA) coverage in your area. Or migrate to a different provider with either enough 1900 towers to get you by, or 3G.
Complicated? Yes. But your problems, like everything else, will be bigger in Texas!

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