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 utilises the Telstra 4G mobile network to provide data coverage across most of the country so you'll be able to stay connected when you're on the go. This SIM operates through Boost, which utilises the Telstra 4G mobile network. You'll be able to 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 setup an auto recharge option. It includes 6 GB of mobile data for use within Australia and unlimited calls and text, plus 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.