htc touch dual quad band

[Guest mbach]

I'm receiving an htc touch dual soon that I purchased on a well know auction site. The seller assures me it is the htc touch dual designed for the American market with 850 band and 850/1900 data bands. I'd like to know if there is a quick diagnostic (button pushes, or software) so I can determine this upon receipt of the phone. I suppose I could drive out into the country and assume I'm out of the 1900 band, but I'd like a more certain solution. thanks mbach