tmobile bands

I know that T-mObile USA 's main band is GSM 1900 MHZ and that it uses 850 only in some roaming, while Cingular uses both 1900 and 850 !

Can you tell me which area do you need the 850, and is it of a vital importance or not?

thank you, mike!

tmobile usa uses 1900 natively and 850 when roaming, so you'll need a dual-band GSM 850/1900 phone at least. Best is quad-band 850/900/1800/1900 phone that can operate on 100% in USA, europe and asia!

the Personal Coverage Check on t-mobile's website can differntiate the 850 coverages