If you’re looking for an affordable yet reliable option, I’d definitely recommend checking out Nextelle.

They offer a $20/month plan that includes:

Unlimited data

Unlimited national calls & texts

No lock-in contracts

I’ve been using it for a few weeks now — works great for streaming, hotspot, browsing, etc. Coverage has been solid (I’m in Melbourne), and customer support was responsive when I had a SIM question.

More details here: https://nextelle.com.au
Or you can call: 1300 269 126