Trying to use UK iPhone 5s abroad

Hi I have a UK bought iPhone 5s. It's a1457 model.
I am trying to use it in South Korea on 4G LTE and their iPhone 5s are all a1530 models.
I was wondering if it's possible to use my a1457 over there. The essence of the question is if it's possible to use 4g over there.
Also was wondering if it's possible to check if my iPhone is unlocked. Got it as a gift so unsure if it's unlocked.
I'd love to try another SIM cards though nano sims are rather expensive to just buy as they go for £10 a piece?
I'm currently on 4G EE and it works perfectly on EE though never tried another network so quite unsure
Thanks in advance!

Thanks kiltedtim.
I will have to check with apple or my network provider if it will work or not
As far as I found that one of the Korean service providers use LTE frequency of 900mhz and 1800mhz when my network provider Everything Everywhere in UK use 1800mhz only. If both use somehow at 1800mhz wondering it might work? I am quite lack in knowledge when it comes to these tech bits.
Cheers anyways!

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