Internet access in Japan.
You may think Japan is one of the Internet popular countries. In fact, it is true but for the visitors from foreign countries. There are so many Wifi signs in Japan. But these signs/logos are only for the people who has the cell phone/smart phone in Japan. If you are very connected person to the internet, it would be better to have your cell phone with international roaming service. There are three major carriers in Japan, Docomo, AU, Softbank.
If your cell phone company has the roaming service with these 3 carriers, just tell the operator to have international roaming service in Japan.
Another option is to rent a mobile router at airport. When you are going to return to your home just bring it to the counter or mail it to post.
The price is 500 - 1000 Japanese Yen /day.
Please visit my homepage,
"Most useful/Most useless travel tips in Japan"