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How to unlock kt service provider to other networks?

Hi, I desperately need advice on how to change my phone’s service provider to other networks. I am currently in Nauru where we use Digicel as our network however I am not able to make calls or send text messages. This Samsung s7 phone is not usable in this country and I am seeking help in changing the network system.
Kindly seeking advice and assistance!

No idea mate. But I would like to learn.