Also, you can check it on the My au app, the breakdown of your paper invoice, or on the customer copy you received when signing up for a new contract or changing your contract details.
Important notes
This page uses images from My au for explanations, but the same operations can be performed on My UQ mobile
This page will explain on how to check your "customer code" [お客様コード] (8-digit alphanumeric).
Depending on the procedure, you may be required to enter a number with a similar name, such as a "billing code" [ご請求コード] , so please check the name of the number you are being asked to enter.