Do I need to make procedures for each line when changing the payment method for "Omatome Seikyu Service (combined billing method)"?
回答
Procedures for each line is not necessary.
Please change the payment method of the main line of "Omatome Seikyu Service (combined billing method)."
However, if you cancel "Omatome Seikyu Service," the payment method and the billing address will basically be the previously registered ones with the communications company, which you had before "Omatome Seikyu Service."