Can a sprint iphone 4 be used on straight talk?

I have a sprint iphone 4. I'm wondering if I can use it on straight talk without getting it unlocked. I have done some research and have found that it is a CDMA. From what I have gathered it looks like all's I need to do is purchase the network access code from straight talk and I'm good to go. Anyone done this? The phone is NOT unlocked and DOES NOT have a SIM card slot…

Added (1). I know it CAN be used on straight talk by using a network access code instead of a SIM… But I was told it couldn't be locked to the sprint carrier… If it can't be unlocked how do I flash it. And what's the difference between unlocking and flashing… Has anyone changed their iphone 4 from sprint to straight talk

Go here and check it

http://www.straighttalkbyop.com/

Calm down!

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