Yes, it does work however we recommend that you consider contacting your mobile phone provider to add an international calling/texting/data plan for the duration of your stay, as you may not be able to use your mobile phone in Ireland without a pre-paid international service plan.
Calling information:
The international dialling code for Ireland is +353 and for Northern Ireland & Scotland it is +44.
When dialling an Irish number from abroad drop the preceding 0 from the local area code e.g within Ireland our telephone number is 086 3616935 outside Ireland our number is +353 86 3616935.