Legally Unlocked 3G - how can I use when vacationing in USA?

I have a 3G iPhone, legally unlocked by Optus (standard in Australia). I'm going to be visiting the US for a vacation shortly, and want to use my phone for both US phone calls as well as data.
Obviously I don't want/need some kind of permanent subscription.
Any suggestions for a good strategy would be appreciated.

An iPhone unlocked by Optus in Australia will accept a SIM from non-Australian networks.
I was in the USA recently. You can purchase a cheap Motorola AT&T Go Phone in places like Walmart for $14.95. I did this in Hawaii. You then call them via a 1-800 number on another phone or via the website to activate it. You will need to provide US address details, including Zip code. You can then use the SIM from the Go Phone in your iPhone. The $14.95 does not include any call credit. You have to purchase that by the standard means. Check out http://www.att.com/gophone .
When unlocking a phone you should ensure it is unlocked before you leave the country. It is a lot harder to rectify once outside the country.
There are two main GSM-based networks in the USA: AT&T and T-Mobile. With an Optus SIM you can roam onto either. With an unlocked iPhone you can even use a T-Mobile SIM. I believe you won't get any 3G service on the T-Mobile network as it uses a different band than those supported by the iPhone, although someone may correct me on this.
Message was edited by: Matthew Smith

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