Please unlock my international lock for my Iphone

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Please unlock my international lock for my Iphone

Sim card has locked and Trying to unlock it

I have registered more than 40days and I did not buy the iPhone from Boost but it is boost mobile phone and it's also fully paid off. I am traveling to Korea and Just got a sim card from the Korean and just put in my iPhone x and it says invalid sim card and figured that my phone has an international lock on. Could any agent help me to unlock this? I will provide any information that you need.