Not able to use my UK unlocked iPhone 4S with SK telecom in Seoul, south Korea

Hi All,
I've a Factory unlocked iPhone 4s from O2 in UK; it was working fine in UK and India. But when I'm trying to insert a SK telecom sim in Korea, it shows as "No Service". I've checked all the settings and even 3G Data Calls are enabled. Kindly advice.

Would really appreciate any help with this folks.

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