How to use my Jailbroken iPhone 4s from the US in Ireland when I go?

I have my phone through V***n in the US. I'm travelling to Ireland soon and need to know the best way to make local and long distance calls from there and avoid the huge fees V***n will charge me. I'm supposed to let them know when I travel so they can adjust my plan temporarilt while I'm there. Is there an app or a better way to use the phone without getting charged crazy money per minute? Can I buy a prepaid sim card for the iPhone or what is the best way to go about it?!

It's a verizon phone, so jailbreaking it did absolutely nothing for you.
The radio is a CDMA radio. Ireland (like the rest of Europe) uses GSM radios. So your verizon phone is utterly useless anywhere outside of the USA.

Go to internet cafes and communicate that way, don't make calls

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