Please be requested to manually select and connect to Singtel Optus Limited network provider in Australia as it is recommended. Turn off and on your phone and then perform this troubleshoot. You will not require a data SIM card to use one of our WorldSIM cameras. Please be suggested to visit this link https://www.worldsim.com/cameras to explore our exciting range of cameras. For any further support, you can also call +44 (0) 20 8819 2557 to get to our customer service team. They are available 24 hours a day, 7 days a week so there is always someone to take your call. Thank you for your valued custom. Regards, the WorldSIM team.