Save 20% on eligible SIM plans for 12 months when you switch to Optus. Simply select either our Small or Medium Choice Plus SIM plan and use promo code YES20 at the checkout. Ends 30/06/25. Must use promo code in check out. Discount applies to plan fee only and reverts to standard price after 12 mths. Discount forfeited if customer cancels. T&Cs and eligibility criteria apply. | Optus