Can you put an iPhone 4 with no contract, into a Straight Talk Plan?

I'm 18 years old and an incoming college student. I need to have a phone I'm familiar with (preferrably an iphone) I use my iPod all the time, but it's definitely time to upgrade. My friend offered to sell me her iphone 4s if she gets a 5. Regardless, if I find an iphone 4 or 4s without a contract, will I be able to apply that towards a Straight Talk Plan? $45 a month would be wonderful for me. But I'm unfamiliar with the world of phones and plans and such.

You should check out the Walmart and Straight Talk to offer the iPhone on its $45 No Contract Unlimited Plan
I'm sure it will be helpful for you
http://news.walmart.com/news-archive/2013/01/08/walmart-straight-talk-to-offer-the-iphone-on-its-45-no-contract-unlimited-plan

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