Moshi moshi
It used to be a lot easier to buy a prepaid mobile phone in Japan.
As they now require some other registration cards than your passport, today it is not quite realistic for visitors to buy a phone in Japan.
We cannot guarantee that you can use your mobile phone from your country since we don't use GSM phone system in Japan.
We recommend you RENT one, not to buy one if you stay in Japan as a visitor for less than 3 months.
The rental fees vary, depending on the period of length, but it wouldn't be more expensive than 7,000 yen for a month.
We provide you with more information at the front desk.