are you trying to get evdo to tether? then yes, a data card works.
To the best of my knowlage, (however, i've been out of the game for a bit, so i could be wrong) there are NO EVDO capable phones out there with tri-band. The two new motorolas (the new razr S, and the new bar type) are both 1x only.
The samsung messenger is triband, but its data is 1x only.
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