With au, you can quickly call from Japan to overseas without the need for extra procedures.
"Calling overseas" is a service that enables any of our customers to easily make international calls from their current au phone without the need for extra procedures.
010 → country code → recipient's telephone number
001 International calling (au International Calling Service) charges will be billed the following month by au in combination with au telephone charges.
The charges for each country of the world can be seen here.
(A separate application is required to use 001 Kokusai Mobile Talk.)
See below for details.
If you are subscribed to an eligible Flat-rate Data service, you can make international voice calls to eligible countries and regions up to 50 calls each up to 15 minutes for a flat rate.