The best eSIM for Ireland depends on how much data you need, but for a typical trip eSIM Ahora offers plans from $0.90, activated by QR code in about 30 seconds with no roaming from your home carrier. A 3 GB, 30-day plan costs $3.68. You connect, with top-ups available and nationwide coverage. It includes EU roaming if you continue your trip across Europe. Compatible with iPhone XS or newer, Samsung Galaxy S21+ and Google Pixel 3+.
Full-speed data every day; after the daily cap the speed is reduced.
Full speed up to 500 MB/day, then 512 Kbps.
Every eSIM can be installed within 180 days of purchase. Plan validity starts when you first connect.
Your eSIM picks between these networks on its own. If you see bars and nothing loads, you can pick one by hand.
Your Ireland eSIM runs on one network: Eir. Other local networks won't carry your data: if you see signal bars and nothing loads, turn off automatic network selection (iPhone: Settings → Cellular → your eSIM → Network Selection; Android: Settings → Network & internet → SIMs → your eSIM) and pick Eir by hand.
Ireland has three main carriers: Vodafone Ireland (largest nationwide coverage, 5G in Dublin, Cork, Galway, Limerick), Three Ireland (broad urban 5G), and Eir (historic operator, strong in rural areas). Plugs are Type G (British, three-pin), 230V — you need an adapter from continental Europe or the Americas. 4G coverage reaches the entire Wild Atlantic Way (Cork to Donegal) and most tourist villages like Doolin, Dingle, and Kinsale.
Dublin (DUB), Cork (ORK), and Shannon (SNN) airports offer unlimited free WiFi. The currency is the euro; Bank of Ireland, AIB, and Permanent TSB ATMs accept Visa/Mastercard with no commission up to €600. Tips are 10-15% at restaurants (sometimes included as service charge). Driving on the left — British legacy. Alcohol is central to the culture (pubs are social hubs) but DUI penalties are serious. Pub tipping is NOT given to bartenders. Free Now and Lynk apps replace Uber (which doesn't operate as a passenger app in Ireland).