How to solve communication problems when traveling to Japan?

Japanese airports have mobile phone rental counters. You can rent a mobile phone by paying some deposit.

However, the phone bill of the rented mobile phone is quite expensive. The telephone number at Tokyo Narita Airport seems to be 200 yen a minute.

I suggest you buy an international long-distance telephone card, which is sold in the supermarket at the airport. Generally, it is 0/000 yen per card, which can be used for a long time. Better than renting a phone.

If you make a local call to Japan, many hotels don't charge for local calls. You can ask at the front desk of the hotel.