Tips Want to use local SIM card in Australia - Galaxy 5

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http://androidforums.com – Help! Too much information out there - hard to sift thru it. I have an unlocked T-Mobile Samsung Galaxy S phone. I currently have an unlimited data plan with T-mobile here in the states. Going to Australia and would like to use my phone without charges. Can I use a local prepaid SIM card for local calling only (no data plan) and use WiFi as I find it to do my Internet stuff? This is my first experience with a smart phone. In the past I always bought local SIM cards from the country I was traveling in for my basic Razr phone and had no problems but all of the settings on this phone are making (General)