Mobile phone coverage has improved dramatically in recent years. A certain national telecommunications company installs a temporary tower just for the weekend, which enables users of that particular network to get reception as though they were in the CBD. So that’s nice.
However, don’t rely on mobile phone coverage, particularly if you aren’t using the Telstra network. Also remember you don’t have access to power out there, so bring a power bank or car charger kit. And maybe a car too.