Iphone 4 verizon work in ireland if i unlock it?

I bought an iphone 4 on ebay that's locked to Verizon. I didn't know at the time but now I'm wondering will it work on o2 if i unlock it? There's something about Verizon being a CDMA network and o2 being GSM and apparently they don't work together.

A verizon iphone 4 is only compatible with CDMA networks.i. E. It's radio only 'does' CDMA which does not exist in ireland

Check the verizon travel planner (first link)…

If it is a iphone 4s (I know you mentioned 4 in the question, but just in case… ) it *is* compatible… See the second link…

No verizon iphone will not work with gsm card.

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