Is straight talk service up under verizon wireless?

I'm buying my girlfriend an anniversary gift and it's going to be an iphone 4. Her service is with straight talk, but I found an iphone 4 on Amazon for a good price but it says it's with Verizon. Can I still get that phone without having to change her service and keeping her SIM card?

No. Verizon's iPhone 4 doesn't even use a SIM. And Verizon's iPhone 4s only uses a SIM for roaming outside the US Sorry.

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