Will a US GSM phone work in the Caribbean?

[AC Question]

I have the option of buying either a Global or US GSM version of an unlocked phone. Will the US GSM simply not work internationally or will the coverage just be better if I bought the Global GSM?

 

[Almeuit]

GSM is mainly used outside the US so it should work. I would ensure you have the right plan though so you do not rack up a lot of charges.