Talk:Japan/@comment-5.152.248.5-20170731233501/@comment-2A02:1811:D15:D200:58B0:9EE8:CCE5:834B-20170808125321

See my post above, I would recommend the Wi-Ho datasim if you can find it. The simcard is active during a month; if you top-up you activate it for a new month. I didin't try to activate from abroad but probably this could work. To be on the safe side you could buyt the sim in the first week and top up (1GB for 1980 Yen) before you leave so you are sure to keep your card active for the last week.