Can I use an Iphone 4 or 4S with straight talk?

My friend is getting rid of his old iPhone and said he'd sell me it if I wanted it. Its on ATT but I use straight talk unlimited plan. I know you can get SIM cards from Straight talk for GSM phones and was wondering if I can do that with the iPhone 4 or 4s (Not sure which.Id assume it wouldn't make too much of a difference if I could or could though.)

Added (1). Also could someone link me to how to unlock it? IF ITS POSSIBLE

Yes, you can use AT&T iPhone 4 and 4S on StraightTalk. You just need the StraightTalk SIM for AT&T phones which StraightTalk recently stopped selling and use it in your iPhone.

Unfortunately, Straight Talk no longer sells SIM cards compatible with AT&T devices. (I've included a link to an April 2013 article that confirms the partnership no longer exists. You also can't find AT&T under the "Shop" section on Straight Talk's SIM site.) Sorry.

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