Can I use my t-mobile sim card to work with a iPhone 2g?

Im thinking of buying an already unlocked iPhone 2G from online (like amazon.com). my plan with t-mobile is just a family plan with unlimited text and like 500 minutes of talk but no data plan. So can I simply just
Purchase the phone and then pop my sim in there and BAM it works? And can I just use the phone's wifi to use the Internet since i don't have a data plan? THANKS SO MUCH!:)
 
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