How to change a verizon iphone 4 to straight talk?

My friend is getting a new phone and I'm getting their old iPhone 4 and to know how to change it to straight talk

You can't put Straight Talk service on a Verizon iPhone Since the Verizon iPhone doesn't have a slot for the SIM card which Straight Talk uses for their devices. If you want an iPhone on Straight Talk you'll need to buy one from Straight Talk.

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