How to unlock a verizon iphone 4s for GSM use in the united states?

I have an iphone 4s from verizon and i was wondering if it was possible to unlock the iphone for GSM use in the unitedstate. I have heard people say that you can only use the GSM for overseas. But i didn't know if there was a way to get it to work in the US. Please let me know what you think. Thanks.

Added (1). Is there any other cheaper way to do it? Like with an r sim?

Yea there's but its too expensive. You can find unlocking services on ebay for verizon iphone 4s for around 100-200 bucks

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