If you in possession of the old optus unlimited $2/day for unlimited data SIM card please disregard this thread.
I use two SIM cards and cannot get broadband internet where I live.
1) Telstra Freedom plus ($40/month) pre-paid
-unlimited talks/text
-6GB data
-$350 international credit
-$40 of Google play money!!
-Telstra network
2) Vodafone 365 day ($20/year) pre-paid
-$3/2GB data add on for 24hrs
-unlimited recharges
Basically, I use Telstra freedom plus for unlimited talks/texts and the extra Google play money. When I'm at home and use the internet I do a 2GB add on with vodafone for $3.
Telstra Freedom plus - 3GB of that is "night use" only