Guy and Allyson,
Thanks for your interest and support for the T-Mobile Sidekick.
I am sorry that you weren’t able to get answers to your questions.
The Color Sidekick has a US single band radio. It is not a Triband, but a 1900 Mhz U.S. device only.
Later this year Danger, the developer of the Color Sidekick, will be introducing a Triband version of the device. It will be available in Europe and most likely in the U.S.
Perhaps at that time, T-Mobile could offer an upgrade program, but that would strictly be their decision.
I am currently using a prototype version of our Triband phone and I am in Europe frequently. It works extremely well in Europe.
We are going through the final certification process of our device in Europe and then it will be launched.

I hope this helps answer your questions.

Best regards,
Hank Nothhaft