Sprint iPhone 4S on straight talk?

I just bought a sprint iPhone 4S, I called straight talk and asked if it would work if I got a straight talk micro SIM card and if I would get service everywhere I do now with my AT&T android, her answer was yes it would definitely work. Also THE PHONE I BOUGHT TODAY DOES HAVE MICRO SIM CARD SLOT. I've seen a million different answers on google tho. Has anyone tried this or is doing it now? Please give me and answer and explanation.

It may have a sim card slot, that still does not mean it will work. But, here are better explanations…