data japanData for Japan, Korea, Rep. from The World Bank: Data. Free and open access to global development data. Free and open access to global development data. Data. This pageGSky currently offers seven eSIM data plans for Japan. The five fixed data plans range from a free 100MB, 7-day option to 10GB for 30 days. The two unlimited options include 7- and 15-day plans. In addition to the Japan