In Australia this would be quite different. You'd have zero trouble buying food, except at very small places, but might have to think a bit laterally for some

In Australia this would be quite different. You'd have zero trouble buying food, except at very small places, but might have to think a bit laterally for some of the transport options. Just about anywhere that'll take a credit card will take NFC Payments via Paywave/Paypass. In Australia, that means being with a bank that has an Android app that has Paywave/Paypass. Taxis are all equipped with NFC readers. To catch a bus or train in Sydney you could buy paper tickets (more difficult for a train), but you could probably just buy a new Opal card and load credit onto it at a store. Parking would be difficult if you're in an area that has paid parking at the station.