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Re:Launch HN: Solve (YC S17) – We Save International Travele... by tixocloud on Tuesday June 20, 2017 @04:06PM (#14598099)
I used a pocket wifi from Sakura Mobile when I was Japan - https://www.sakuramobile.jp/

They delivered it to my hotel and it was easy to set things up.

Re:Launch HN: Solve (YC S17) – We Save International Travele... by Pamar on Tuesday June 20, 2017 @07:58PM (#14599561)
Basically the same (except I used Rentaphone, as mentioned above).