Talk:Japan/@comment-88.88.203.223-20150105181213/@comment-46.208.72.64-20150106175354

To reply to my own question: I've just heard back from Wasabee, who recommend a prepaid data SIM and the SMARTalk app. See http://ip-phone-smart.jp/smart_en/ for the latter. This seems to be the best I've heard of so far.