mmhh.. I think that is quite a confusing question for many. I asked the same topic on a different board a while ago..
Some will tell you it's possible and that there are many Hot Spots (for free) around Japan.. and some will tell you, that it's hard to find them and that they are not really useable without a set amount?!
I am really stuck right now, whether I should by a Smartphone or not?!
lol^^
also here..
FREESPOT
and..
公衆無線LANサービスはYahoo!無線LANスポット - Yahoo!無線LANスポット