Sorry I know this is a super old comment, but I was browsing my comment history.
Australia has 3 networks that actually build and own physical towers. Telstra, Optus and Vodafone. Any other network is a reseller of one of these 3.
Optus seems to be the most common that is resold. I know belong and Aldi resell Telstra but I don't know any that resell Vodafone (could he wrong).