Can I use my Korean iPhone from KT in the USA?

I bought an iPhone 4 in South Korea from the KT company.
I am not sure if it is unlocked or locked.
Is it possible to use this phone in the USA with an American phone company?
Thanks

If you purchased the phone form a company in Korea, then it is likely that the phone is locked, so no you will not be able to use it in the US except with the international roaming feature enabled from your company which can be quite expensive.  The only way that you would have an unlocked phone is if you purchased it from an Apple approved retailer in Korea that sells unlocked phones.
You will not be able to use any US CDMA carrier either - this is not possible.

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