Iphone activated with Straight Talk sim card?

So i've heard that you can buy a iphone from AT&T, Tmobile and i think Verizon and can buy a Straight Talk sim card, pop it into your phone and your phone is now activated with Straight Talk so it's where you only pay $45 a month (Unlimited Minutes | Unlimited Data | Unlimited Messages) But my question is can i buy the iphone with a 2yr contract then insert the Straight Talk sim card which i was planning to do. Or do I HAVE to buy the iphone without a contract ($450.00) to be able to do so? Sorry for making this so long but i need to know.

You can do it either way the only difference is you'll have to pay for two years of service on AT&T combined with straight talk or just pay 700 or whatever for just the phone. If I was you I'd go on Craigslist and buy one for 300 no contract.

The phone would have to be unlocked in order to do that, and you know that if you sign up for a 2 year contract with AT&T or something then you're stuck with them unless you want to get charged an early termination fee, right?

The whole reason contract phones are cheaper is because they subsidize the cost of the phone because you'll pay at least that much with your phone plan, so getting into a contract just to cancel it isn't really a good idea. You should just buy an unlocked iPhone if you're that set on using it with Straight Talk.

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