The short answer k-y is that AT&T, the largest GSM provider in the US, uses the 850 and 1900 mhz bands, with predominant usage of the 850 band in most areas. Tri-band phones support 900/1800/1900, but lack the 850 band.
The same is true for UMTS/HSDPA. AT&T's currently deployed 3G network relies on some oddball (compared to the rest of the world) bands.
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Benson Leung @ Nov 4th 2007 1:20AM
The short answer k-y is that AT&T, the largest GSM provider in the US, uses the 850 and 1900 mhz bands, with predominant usage of the 850 band in most areas. Tri-band phones support 900/1800/1900, but lack the 850 band.
The same is true for UMTS/HSDPA. AT&T's currently deployed 3G network relies on some oddball (compared to the rest of the world) bands.