Wi-Fi service is available at all stations across the Tokyo Metro network. Tokyo Metro now has expanded Wi-Fi service for international travelers into the train cars on the Ginza line. A large number of popular tourist spots are dotted along the Ginza line such as Ueno and Asakusa. Train cars that display Wi-Fi stickers signify Wi-Fi availability. It’s easy to set up and access. Next time you visit Tokyo, try out the service and stay connected.
For more information, please visit here (PDF).