Iphone with Straight Talk wireless

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I need to switch the iphone to my straight talk account. Is there any way that I can do t;hat? I would love to have it to my account, but, don't know how to. also for another word of the mouth, the iphone came from sprint and have had the phone for a couple of years. If that would help any. If you need more info about the phone, please feel free to ask.