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Optus generally just provides free data (not free subscriptions). If you want to join Netflix (or any other service just go to their website and join up.) Use the Netflix Apps on your TV, FetchTV, Mobile phone etc. and Optus will automatically provide the data as free (note you may need to activate the free data option under MYACCOUNT or in the OPTUS mobile App. )
Netflix has a 30 day free trial so you can join and then immediately cancel if you want (the remaining 30 days will still be available for use)