Australian Mobile Providers - Carriers & Mobile Virtual Network Operators (MVNOs) | IDD
http://www.idd.com.au/mobile-providers.php
A list of Mobile Virtual Network Operators with their parent networks.

How to use less data on your smartphone
http://accan.org.au/tip-sheets/how-to-use-less-data-on-your-smartphone
Tips for using less data on your smartphone. For iPhone and Android.