[I thought about posting this in Travel Technology, but since it's so Japan-specific, I thought it would be better placed here.]

I'm somewhat familiar with the complexity of the Japanese wireless phone market and how it's very different from anywhere else in the world. I usually just rent a phone at NRT upon arrival, although once I did rent a 3G DoCoMo handset at the airport and put my US T-Mobile SIM into it and was able to roam fine (so I know that my SIM will roam in Japan).

Now, I have a Nokia 6630, which from what I've read in other posts on FT will roam in Japan in 3G mode. So, I think for the first time, I'll have a phone that I can take with me to Japan and have it work roaming-wise.

But here's the question: will I be able to use it to provide wireless Internet access for my laptop? For $19.95/month I have the plan option that does this for me in the US. T-Mobile says that when roaming internationally, data access of this sort is $15/MB. But I'm not sure if this will work at all in Japan with this phone and any of the Japanese networks that have roaming agreements with T-Mobile. Anyone know?