So you will only be able to use it on a wifi connection? Still not sure if your thinking it will work on T-mobile for data here in the US.
Edit: I just found this article from Dec. 19th that states the Touch HD does work on US 3g networks!
"The HTC Touch HD, it turns out, is compatible with 3G networks running the 850/1900Mhz spectrum.
In a surprising turn of events, HTC has released the HTC Touch HD’s service manual. The manual reveals that the HTC Touch HD is, in fact, capable of surfing 3G data networks in the US.
It seems that HTC decided to endow their high-end touchscreen smartphone with the necessary 3G hardware to work on just about any 3G network in the world. We knew that the HTC Touch HD would sport 3G frequency support in the 900Mhz and 2100Mhz WCDMA bands, but we had no idea HTC would sneak in support for the 850Mhz WCDMA band that us Yankees love so much. Unfortunately, the HTC Touch HD’s newfound US 3G compatibility isn’t likely to prompt any US carrier (AT&T (NYSE: T), we’re looking at you) to pick up the HTC Touch HD in subsidized form.
The good news, however, is that HTC Touch HD fans can import an HD and rest easy knowing that it’s fully functional within US borders. With a 3.8-inch WVGA touchscreen (480 x 800 WVGA), 5 megapixel camera, full 3G support, GPS and WiFi under the hood, the HTC Touch HD is without a doubt a handset worthy of importing into the US. Start scrounging for couch-change!"
http://www.intomobile.com/2008/12/19...-surprise.html
T-mobile however uses a 1700mHz band. Quote "if T-Mobile brings the Touch HD to the USA, it will be internally re-worked to support T-Mobile USA's band of 3G for data and voice communication, which operates on an entirely different frequency than the rest of the world."
You may have better luck activating and using it on AT&T. Even then I think it has to be reprogrammed to work on the 850 mHz network! Keep us updated on whether it works on their data network!!!