I’d feel happy with those on my head too

Probably insurance, permit fees and marketing at a wild guess.

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).

Have you considered Aldi Mobile? They use the telstra network with some towers excluded. I don’t know if there’s a way to look up what towers are excluded, but I was under the impression that it was remote towers where no competitors service.