Can I put a used AT&T Gophone sim card in an iphone 3GS?

I currently am using an At&T fusion phone from the gophone. Although I heard that you can use an iPhone by puting an activated gophone At&T simcard in it. I have a question though, is it possible that if I take my GoPhones sim card out and put it in the iPhone 3Gs will it work? Or do I have to by a brand new sim card?

And if there's any other information about switching your GoPhone to your iPhone 3Gs that would be fantastic!

Your sim WILL work with one exception. You will not have internet access unless you have Wi-Fi.

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