You should buy sim cards to your mobile system from Optus, Telstra or Vodafone during the International Terminal arrivals hall. These outlets are generally open until eventually 11pm. However, it can be worth noting they don’t always offer you the variety of special (less costly) bundles accessible in the city. https://sydney-international-airp18361.wssblogs.com/30560711/rumored-buzz-on-sydney-airport-taxi