Is it okay to sell the phone used in America in Korea?

I heard that you can't sell a phone that you used in the U.S. directly in Korea. Is it okay to sell the phone that you used in the U.S. in Korea?

I used this cell phone while I was in the U.S. for about 2 years, but I didn't know if it could be sold in Korea.

410 2018-11-13 Gentleman

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