Talk:Japan/@comment-41.215.171.208-20170402121329/@comment-3564598-20170410211505

None of the tourist SIMs work outside of Japan. As you are concerned about your number, I am assuming you are on docomo itself or a resident plan of an MVNO. If you are directly with docomo, yes it will, but at very high rates (but at the end of the day, it's your money). If it's an MVNO then check with your MVNO to see if they allow roaming.