What service providers will allow me to use an unlocked iPhone?

My contract is up for Verizon and I have a 4S. I really don't want to pay $110 a month when I'm not leasing a phone. I don't want a new phone, and I know virgin won't let you use an unlocked phone. I want something similar where I only pay around $50 a month for phone/data/messaging.

None. It's a CDMA device.

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