As a regional customer, you can get 3 months' plan fees on us when you sign up to any 12 Month SIM plan. Offer available until withdrawn.
I assume would only need a regional address.
you can check online for eligibility postcode.
here is the Nitty Gritty
3 Months Access Fee Discount: Get 3 months of access fees credited back to your account when you sign up to a new My Plan Plus 12 month SIM Only plan. Available in selected stores. Available via Online, Telesales or Webchat to customers who live in selected postcodes. Visit https://offer.optus.com.au/3mthbyo for participating stores and eligibility requirements. Credit applied from 2nd bill , you will get 1 month access fee discount over 3 consecutive bill cycles. Cannot be used in conjunction with Welcome Credit Port In Promotion.
Regional buyer might also find this MOBILE NETWORK COVERAGE info handy