Another data point: Australia basically only has 3 nation-wide mobile networks. They're broadly compatible from a handset perspective - sometimes there's bette

Another data point: Australia basically only has 3 nation-wide mobile networks. They're broadly compatible from a handset perspective - sometimes there's better coverage for one or the other in some area or newer tech but for most day-to-day use you can get a SIM from any carrier and expect to be able to use it any (non-network-locked) device.