Can I use my unlock iPhone 4S (bought from UK) in Hong Kong?

I've heard about the GSM and CDMA carriers but not sure what they are?? So can the unlocked iPhone 4S be used internationally? I'll be travelling to Hong Kong and will get the micro SIM there. 

jasdeep1901 wrote:
Apple doesn't have a feature of global warranty or something?
Not for iPhone. The problem with warranty/support in India is that such is handled by the official carriers, not Apple, and they absolutely will not touch any iPhone not purchased from them.

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