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It would be written on your monthly statement on page 1. If you don't have access to your bills you would need to call into Telus. After you verify yourself they'll be able to provide it to you.
Your account number would be listed on your paper bill, if you're unable to locate a bill you can contact a team member and they'd be able to help get you set up online to make payments. You can reach out to an agent via phone at 1-888-811-2323, via online chat at Telus.com, or via Facebook or Twitter (@TelusSupport)