Sakura WiFi
I just ordered the Sakura MiFi mentioned in an earlier post for 5800 yen including tax. This is for 3gb over two weeks. Didn't want to mess up my iPhone settings and this way I can tether all of our iPhones and iPad to the MiFi when there's no WiFi signal. They mail it to the post office in Terminal 2 at Narita a couple of days before our arrival.