How to get iPhone 4 on straight talk?

My sister bought here on straight talk, and I'm wanting mine on there. It's currently not in any service so it's like an ipod, but it's been with Verizon. How can I get straight talk for it?

If you want an iPhone with Straight Talk, you'll have to buy one from Straight Talk. You can't activate a Verizon iPhone with their service since the Verizon iPhone doesn't have a slot for the SIM card which the iPhones bought from Straight Talk do.

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