is ipad mini retina cellular unlocked? (International)

I am studying abroad in NYC and I'm Korean. I am thinking of buying Ipad mini retina cellular model. Is it unlocked? if it is, then can I use korean carrier sim card when I am in korea? I am going to use T-mobile or AT&T when i am in US and change sim-card to Korean carrier in Korea. Can I do that? or should I just buy Wi-fi model?

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