Can an Unlocked Iphone 4S bought from apple in Ireland work on any network in the USA?

So im moving to the united states in a months time and im considering buying an unlocked Iphone 4S from Apple here in Ireland. Can I still use the phone in Boston when I move there? Will there be networks I cant use? As I understand it the 4S supports GSM and CDMA networks worldwide. However on other websites I have read that If I buy it here then it will only work on AT&T over there. Is this true and if so,, Why?
Any insight would be greatly appreciated! Thanks, Ryan.

Can I still use the phone in Boston when I move there?
Only on a supported GSM carrier.
Will there be networks I cant use?
Yes. CDMA networks.
As I understand it the 4S supports GSM and CDMA networks worldwide.
No, you've misunderstood. The GSM iPhone you can buy in Ireland supports GSM networks only i.e. AT&T

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