My sim card doesn't work anymore?

I lived in Korea for a while the beginning of this year; left, came back, put my KT Olleh sim card back into my unlocked iPhone 4s and my phone read everything and all of my Korean contacts are back, and when I type a Korean phone number it reads it as a number (because of the different amount of digits) But I do not have service and under "carrier" it doesn't have anything.

You will have to go to the store and see if they can refiger that card ir guve u a new one

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