Hi..Guys does the Factory Unlocked iphone can be lock again if upgrade to IOS7

This is my concerns I have iphone 4s locked before to south korea then they uncloked it if I'm going to uprade it to IOS7 could it be possible the phone will be lock again to it's country carrier many thanks for advices

markytot wrote:
It came from my cousin he purchased the phone to south korea and gave it to me for able to use it to our country he factory unlocked it by whom... I really dont have idea
Apple owns the factory.  If it wasn't unlocked by Apple (this is only done prior to shipping), then it is NOT factory unlocked.

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