I’ve visited Australia as a traveler, apparently I’ve heard that “burner” phones over there are not really anonymous since they literally demand for ID (WTF? That defeats the purpose of it being classed a burner phone) otherwise they aren’t allowed to sell it to you, what’s meant to be a ‘disposable’ phone turns out on buying a regular one when you consider the fact they ask for driver’s license prior to finalizing the transaction.

Don’t even talk about SIM cards for BP, since that too is subjected to KYC in Australia as I’ve learned. They want to harvest data such as driver’s license & residential address (for citizens), or passport info / flight confirmation (return ticket) if you’re a traveler. Without those things: vendors can’t legally sell you a burner phone, so: DON’T BUY A BURNER PHONE IN AUSTRALIA. Their method of acquisition defeats anonymity.