Plan on a Japan vacation in May. What options exist if I want to use my N900 mainly for net access there? Do any of the rental phone services come with data that can be tether to the N900?

Looking into a bit more it seems b-mobile may be the best option for N900 3g data in Japan? Has anyone tried this yet.

The website only shows a USB device; can the sim in it be easily removed & is it usable in the N900?

How does the 150 hours of usage work since were talking about data? Likely much more then I need for a 8 day vacation so can this thing be resold with whatever is left on it?