Prepaid SIM Card for Australians

Australian travelers have a real incentive to investigate prepaid SIM card options when traveling abroad, because a recent report from the OECD has found that Australia is one of the worst countries for data roaming charges. Optus telecom is the worst carrier in terms of roaming charges, with fees per megabyte up to $20, or $20,000 per gigabyte.
The best advice for travelers is to bypass global roaming charges entirely by using a SIM card from a specialist provider, and receive rates up to 99% cheaper than the your carrier's roaming rates. For travel to the US, there's a specialty SIM card from SIMple Mobile that offers unlimited voice, text and data for US$80 per month. Another great SIM card from Tru works in the UK and the US, with cheap rates on both voice and data.