Optus belongs to Singapore's Singtel and runs its own 4G and 5G network. Since 30 January 2025, it has shared its regional network and spectrum with TPG Telecom under an 11-year deal. Its home broadband uses nbn, with 1.07M nbn customers in June 2026.

Fixed network
- Technologies
- nbn fibre (FTTP)nbn HFCnbn FTTC and FTTNnbn Fixed Wireless
- Subscribers
- 1.07M· June 2026, nbn customers
- Coverage
- Australia
Optus plans ride on nbn, where 3.3M premises were on fibre in June 2026 after 575,000 copper-to-fibre upgrades in a year.

Mobile network
- Network used
- Optus
- Technologies
- 5G4G
- Subscribers
- 10.65M· June 2026, incl. 1.03M data-only SIMs
- Coverage
- Australia
Optus runs 2,444 regional sites shared with TPG Telecom, in areas home to about 17% of Australians.