Questions about Wifi only

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http://androidforums.com – Hi, my name is Tiffany. :) I don't have much money, I'm married and I live in the middle of no where, my spouse has a phone and we only have one car so I don't have much use for a cell phone carrier. I saw some posts for using wifi to make calls, but I was kind of confused since I've never had a smart phone before. Is it possible to get a prepaid T Mobile or Virgin Mobile phone that has wifi without paying either carrier for anything? I was looking at getting either the Virgin Mobile LG Optimus V or the T Mobile prepaid Samsung Dart. For example, could I buy one of those prepaid phone (General)