Since I had to do some research on this topic recently, here are the results that I have found. These plans are interesting for people that do not call out a lot, but rather use the phone to be accessible.

GoMobile – Pay as you go plans

Southern Cross Telecom – Pay as you go plans

AAPT – GO15 plan (**needs to be bundled with Landline phone)

** – some conditions apply to qualify for $0 minimum spend)