Doctor Mobile comes standard with a 24-hour free domestic call service, but there are some calls that are not eligible for unlimited calling.
Reference article：About Unlimited Calling
This is billed separately from the monthly fee as a "voice call amount" (22 yen per 30 seconds for domestic calls).
Call Billing Cycle
Billing for call charges is different from the billing cycle for line charges.
Call charges will be billed three months after the month of use.
(Call usage charges for January 2023 → Billed in April 2023)
Below is an example of a request.
*Due to the above cycle, you may be billed for call charges during the contract period after cancellation.
Please refer to the article below for details.
Reference article：I Canceled my Contract but am Still Being Billed/I Want to Know the Billing Details