Originally Posted by
O Sora
The mobile wifi router you rented uses emobile 3G network. Docomo 3G network's connectivity is generally believed to be much better in rural areas.
I can believe it. I knew going into it that it was not going to be as good as DoCoMo, but the price was right. I didn't have any problems in cities, although about half the journey between Fukuoka and Nagasaki had no signal at all.
All the way between Tokyo and Osaka on the Tokaido Shinkansen line, Docomo 3G data communication is available according to the next Japanese article.
To clarify: there was emobile signal the entire way between Osaka and Tokyo, except in tunnels. So, does this mean that DoCoMo has specifically installed equipment in all Tokaido Shinkansen tunnels to allow uninterrupted service? It wouldn't surprise me if they did, as this would be a major selling point.