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Can you supply some more details on this? The radio in the iPhone and T-mobile's 3G spectrum range are supposed to be incompatible (in other words the two operate on different ranges).

In Germany and The Netherlands, T-Mobile has been the official carrier for the iPhone for years. The T-Mobile brand is being used in a lot of countries.

T-Mobile USA is the odd one out, though. It was a preexisting network (VoiceStream) which after being purchased by Deutsche Telekom was given the T-Mobile name for the sake of international brand unity.

Curious, considering that T-Mobile's 3G network is on a frequency that iPhone hardware doesn't support. (U.S. iPhone, U.S. T-Mobile.)

It doesn't seem to work the other way around at least. I wasn't able to get 3G with an unlocked mytouch on AT&T's network.