With Mobile broadband being so very expensive this maybe a way to get around it, 3GB for $10 pre-paid, just buy a few sims
Telstra 3GB Prepaid Micro Sim
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Model Number: 521
Enjoy the freedom to access the internet on the go and because its Pre-Paid, you're in control of your spending.
Telstra 3GB Prepaid Micro Sim - The Good Guys, BuyOnline, Australia