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Q.支払方法の確認・変更はどうしたらいいですか？［SoftBank 光／SoftBank Air／おうちのでんわ］
https://www.softbank.jp/support/faq/view/19244?medallia_route_snavi=sbb-snavi&medallia_snavi_category03=01-006&medallia_snavi_category01_bb=sbair&medallia_route_ivr=n&medallia_snavi_category02=m-01