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Hi there @marba33, you can find your service number your you bill.
For a handy explanation of your bill and how to find important details, please check out Your Bill Explained.
If you're still having troubles finding your service number, please feel free to reach out to us by a private message via our Social Media pages (official Optus Facebook page or Twitter page) where we'll be able to obtain your details securely and assist you further with your query.
Alternatively, you can reach us on a smart device via our Messaging service on the My Optus app 24/7.