Sprint iPhone 5 to Straight Talk?

I have a Sprint iPhone 5 activated at the moment, but I have plans of terminating my contract because the service where I'm sucks. I have already heard from multiple people that Straight Talk works great out here and what I'm wanting to do is terminate my plan with Sprint, but keep my iPhone 5 and use it on Straight Talk. I'm reading a lot about unlocking? Not sure how that would work if you could explain that. I'm also reading something about Cdma and Gsm again something i know nothing about. I would just like to be knowledgeable on all of this before I cancel my contract with Sprint. Can I just get a GSM card from Straight Talk and be done with it?

Not possible, a sprint iphone unlocked of not will only work on sprint.

Cdma doesn't have simcard slot
Gsm has simcard slot
If you are out of contract you can ask sprint to unlock your phone otherwise you can buy a rsim air2 unlocking card on ebay and unlock it to use with straight talk

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