Internode was bought by TPG a long while ago and many of the original founding team started Aussie broadband with similar ideals. They'll end up selling that to TPG too probably, but right now they're ok and they have partnered with optus for cellular tower coverage.

By the way if you want to make informed decisions about cell tower coverage, there's an app called "aus phone tower" by bit bot software which gives you exact cellular tower information. Use that to figure out coverage before you choose a mobile provider network.