Yes. However, please be aware that in the period between completing a request to change the SIM card size and delivery of the replacement SIM card you will not be able to use the SIM card you are currently using.
*There is a SIM card size change handling charge of 3,300 yen (incluing tax) .
Please make your request by calling Asahi Net.
Asahi Net English Customer Support
Phone : 03-6631-0861 (10am to 5pm, Monday through Friday.)
(If calling from a NTT landline, phone 0120-577-135)