How to switch to the Walmart unlimited text and data plan from sprint?

I have an iPhone 5 for about a month and a half and I switched to the sprint unlimited plan from AT&T yesterday. I just heard about walmarts new unlimited plan for the iPhone 5. Do I have to give my phone back to sprint and buy one from Walmart at full price. Someone fill me in here.

Yes you have up to 14 days to return your phone to Sprint. Then to take advantage of the plan with Walmart you would have to buy the iPhone at full price, for example the iPhone 5 16GB is $649 + tax.

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