Using Boost phone in Australia

I have a Motorola i425t phone with the Boost Pay as Go service and in January I'll be traveling to Australia on business and I was wondering if I take out the SIM card for my U.S. Boost service and replace it with a SIM card for the Boost Australia (Optus) service, setting up an account with them and putting a sufficent amount of money into the account then in theory my phone should work without a hitch and when I return back to the states I can take out the Australia SIM card and replace it with the previously used U.S. SIM card and be right back where I started right?

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