How to forward calls to numbers within and outside of Japan

From your app go to My account >> Call Forwarding and follow the instructions.
To forward calls to a number in Japan, please enter a number, including the area code or the mobile prefix. To forward calls to a number outside of Japan, please enter a number, including the country code followed by the area code and the local destination number. Please note that your 050 number must be issued before you can set up call forwarding.