I purchased the Unlimited 180GB 1-year plan for AU$179, which came with a bonus 20GB sign-up data (it renews 30 July). Almost halfway through the year, and I’ve only used 22.58 GB, so I have 177.42GB remaining.
I was able to BYO/transfer my mobile number across.
It’s on the Optus network; I’ve had no issue with reception (except when the Optus network is down)