Local Irish SIM from O2
A prepaid Ireland local SIM card from O2 is your best option for saving money while travelling there. Because everything is prepaid, there are no contracts or hidden charges, so you can take in the sights of this beautiful and ancient country without worrying about your roaming rates.
This SIM card will require a SIM-unlocked GSM 900 / 1800 compatible international cell phone. If you do not have your own international cell phone, you can add one of several models to your order during check out.
Consider the One-Rate SIM for coverage in and 190 more countries
Great for international calls and comes with a US and UK phone number