Do i have too buy a iphone from walmart to use on straight talk?

I want a iphone for straight talk and I understand that walmart sells them. But, do I have too buy it from walmart or can I buy a used one from craigslist like AT&T or Verizon?

This is a little complex, Straighttalk uses both CDMA & GSM phone, so you would need an unlock GSM or a CDMA phone that has been "flashed" to straighttalk.

If the old iPhone is a GSM model that has been unlocked to run on any carrier, you can buy a Straight Talk SIM card from them and install it into the phone. But make sure that it has been unlocked before you buy, otherwise it will not work.

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