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I brought unlocked Samsung Galaxy S8+ from Korea


I was using iPhone in the US, and broke the screen while I was traveling in Korea. I bought an unlocked Samsung Galaxy S8+ and used it with a temporary Korean SIM card. I came back to the US and switched the SIM card with the one from the iPhone. It shows "limited service" on top of it, and doesn't work. Please tell me how to use a Samsung Galaxy S8+ from Korea in the US.