Hi Kyu Kim,
It doesn't matter to me whether it's SK or KT, as long as it is fact unlock and can be used in other countries.
Fount a post from the source you gave :"Your phones should be unlocked straight out of the box ", do you think it's reliable?
i have an iPhone 4s that is soft unlocked - not factory unlocked. should it still be able to be used in south korea? thank you~
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