If I recall correctly, T-Mobile US uses different data plans for Android phones. The plan you have for the HD2 will not work. You need to call T-Mobile and switch to an Android compatible data plan (I think one is called a "smartphone" plan, but am not sure what the other plan type is called). I believe you can switch as often as you like. I have not elected to go through the trouble of switching, and am only testing internet connectivity via Wifi.
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