Boost $30 Prepaid SIM This Boost $30 Prepaid SIM comes with 6 GB of data and unlimited calls and text for you to use within Australia in 28 days. It utilizes the Telstra 4G mobile network to provide data coverage across most of the country so you can stay connected when you're on the go. This SIM operates through Boost, which utilizes the Telstra 4G mobile network. You can choose between a micro-SIM, mini-SIM, and nano-SIM depending on your device. Since this is a prepaid SIM you can recharge at your convenience or set up an auto-recharge option. It includes 6 GB of mobile data in Australia, unlimited calls and text, and some international call and text inclusions. If you recharge with another $30 or more before your credit expiry you can roll over any unused data for use the next month.