Optus, operating in Australia within the Oceania region, is a major mobile network provider identified by the Mobile Country Code (MCC) 505 and Mobile Network Code (MNC) 17. A subsidiary of Singtel, Optus provides a wide range of telecommunications services including mobile, internet, and satellite. Competing with Telstra and Vodafone Hutchison Australia, Optus has established a significant presence with extensive network coverage throughout major cities and regional areas of Australia. Optus has invested heavily in expanding and upgrading its network infrastructure, including advancements in 5G technology, aiming to provide fast and reliable connectivity to its customers. Optus offers various prepaid and postpaid plans tailored to different usage needs and budgets, along with bundled services that include entertainment and other value-added features. Known for its marketing campaigns and partnerships in sports and entertainment, Optus aims to be a customer-centric company, although it has faced challenges regarding network outages and customer service complaints. As with other Australian mobile networks, Optus is subject to regulatory oversight by bodies such as the Australian Communications and Media Authority (ACMA), ensuring compliance with industry standards and consumer protection laws.