Using an AT&T iPhone 5 in Asia?

Going to Korea and Vietnam soon, was wondering if I could purchase a preloaded nano sim card locally and use it there? It is under an AT&T contract, so it is locked in the US, but will it work outside of the US?

Also, can my iphone connect to the LTE signals in Korea if I get a sim card there?

You need it unlocked to work.

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