If I buy an iPhone 5s in Thailand will it be GSM or CDMA?

Looking to buy an iPhone 5s in Thailand, So I can use it with any SIM card around the world I want to know whether the iPhone is GSM or CDMA?

Its both.

I think GSM.

GSM, almost all phones used in Thailand are GSM phones. There are a couple of CDMA providers, but hardly anyone uses them and there isn't a much of a market for CDMA phones. Ask to be sure, but in all likelihood, it will be a GSM phone.

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