On the way back home from seeing the Tulips, we came through Oshiage station which adjoins Tokyo SkyTree. The Tokyo SkyTree is the worlds 2nd tallest tower and it was build only last year. We didn't get to the top of the tower because there wasn't enough time to see everything and it was almost night. But I was happy to see that there was free Wi-Fi connectivity offered by SoftBank. The free Wi-Fi service is a facility offered by SoftBank customers. There is a profile saved in the iPhone that automatically logs into the network called "0001softbank". You can connect to "0002softbank" access point as well. (There is a total of 5 networks supported by their service.)
I ran a speed test on their network and this is what I got. Browsing the Internet was comfortable with those speeds.