For those presently jaded by the "targeted" $45 per month "go mobile" from Telstra, if you have a compatible handset this prepaid may suit.
I like the look of the $30 plan with unlimited calls/sms and 1.5 gigabytes of data, with an option for 500MB extra for $5.
The best part is you can roll over unused data allowance, up to 10GB.
The deal starts on 5 July.
http://ausdroid.net/2015/07/03/optus-launches-data-rollover-…
Update: from Optus:
https://media.optus.com.au/media-releases/2015/optus-keeps-y…
Update - they havent updated the web page yet.
The deal is from here - http://ausdroid.net/2015/07/03/optus-launches-data-rollover-…