I have used T Mobile since 1997. I left them once for a "better service" and went straight back. I have traveled all over the world with TMobile and never have had a problem as long as I tell them I will be traveling out of the USA. If anyone can do it, T Mobile can.

I doubt HTC+T-mob USA may drop the bomb to iPhone or at all.The only HTC can drop is the piece of nonsense like all that gray cheap bricks on this photo they are feeding the whole entire world from day one. 

http://www.intomobile.com/2008/04/21/htc-dream-t-mobile-mda-compact-iv-spotted.html

Funny, seems all the designers of HTC, Sony, LG, Samsung and Nokia were fired a year ago. They all had 1.5 years since iPhone was announced, and there is still no anything decent to compete