You can complete the procedure from My au / My UQ mobile (Web).
In principle, the change will take effect from the payment of the following month after the procedure is completed.
Until the procedure is completed, the current payment method will continue.
Please see below for detailed steps.
After checking the change timing and important notes, select the billing code for which you wish to proceed, select "Credit Card" [クレジットカード] and tap "Next" [次へ].
Read the important notes and tap on "Next" [次へ] at the bottom of the screen.
Enter your credit card information and tap on "Next" [次へ]
Check the registration details, enter your email address, and tap on "Set" [設定する].
You may be redirected to the card company's website for authentication (3D Secure).
In such cases, follow the on-screen instructions and enter the password registered with the credit card company, or a one-time password and tap on "Submit" [送信].
If the authentication (3D Secure) does not go through, please contact your credit card company.
The procedure is completed when you are redirected to the "Application Completed" [受付完了] screen.
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