US TMobile HD2 on ATT

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I have searched through many posts and cannot seem to find many others with the same issues. I unlocked my TMobile US HD2 and have been using it on ATT. Now, I understand the 3g connection problem and how you're limited to Edge, but what I do not understand is that in the Band selector, there is the option for 1900/850. Isn't 850 ATT US's operating frequency for 3G? If so, why shouldn't this phone be able to connect?

you have the data bands and voice bands mixed up

its a quad band phone, for voice, but doesn't support all of atts data bands , only tmobiles , therefore, you get to use edge only on att, not 3g

know what i sayin?

Yeah. Makes sense. Explains why it doesn't say UMTS 850. Lol.

Thanks!