Three Ireland is the easiest local prepay SIM for most visitors, with a €20 all-you-can-eat data plan sold in shops nationwide and no ID required; Vodafone has the best rural coverage and Eir, GoMo, and 48 are cheaper alternatives. That said, a travel eSIM installs before you fly and skips the shop entirely, see our Ireland eSIM guide to compare, or let the eSIM Finder pick for you.
What This Guide Covers
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Ireland's Mobile Landscape
The Republic of Ireland has three mobile network operators: Three Ireland, Vodafone Ireland, and Eir. Vodafone is the legacy carrier with the strongest rural coverage, reaching about 99% of the population. Three has the largest subscriber base and excellent value prepay plans. Eir rounds out the trio with solid 5G and competitive pricing. On top of these, popular budget brands like GoMo (owned by Eir) and 48 (on the Three network) run as virtual operators.
For tourists, the good news is that prepay (pay-as-you-go) SIMs are cheap and easy to get. Three's €20 all-you-can-eat data plan is the standout for most visitors, while Vodafone is the safer pick if you are heading to the rural west coast.
No Passport or ID Needed for Prepay
The Republic of Ireland does not require any ID, passport, or registration to buy a prepaid SIM card. You can walk into any shop, pay with cash or card, and walk out connected. This makes Ireland one of the simplest countries in Europe for getting a tourist SIM.
Republic of Ireland vs Northern Ireland
This guide covers the Republic of Ireland (Dublin, Galway, Cork, the west coast), which is in the EU. Northern Ireland (Belfast, the Giant's Causeway) is part of the United Kingdom and is not in the EU. An EU or Republic of Ireland SIM may roam in Northern Ireland but is not guaranteed to be free, so check before crossing the border.
Three Ireland
Three Prepay: The Value Champion
Ireland's largest network with an unbeatable all-you-can-eat data prepay deal
Three is the go-to prepay SIM for most visitors to Ireland. Top up by €20 every 28 days and you get all-you-can-eat data within the Republic, subject to a fair-use policy, plus free texts and a generous calling allowance. When you cross into Northern Ireland or hop over to mainland UK, Three's plans usually include the UK at no extra charge, which makes it the obvious pick if your itinerary crosses the border.
Strengths
Weaknesses
Vodafone Ireland
Vodafone Ireland: Best Rural Coverage
The widest reach in Ireland, strongest on the rural west coast and islands
Vodafone is the carrier to choose if connectivity in the countryside matters. With roughly 99% population coverage and the strongest signal in the Connemara mountains, the islands, and the hinterland of County Kerry, it is the least likely to drop out on a west-coast road trip. The €20 pay-as-you-go plan delivers unlimited 5G data plus unlimited calls and texts over 28 days, putting it on par with Three on price while edging ahead on rural reliability.
Strengths
Weaknesses
Eir, GoMo, and 48
Eir Prepay: Solid Third Network
99% 5G coverage with strong rural investment and a €20 unlimited plan
Eir is Ireland's third network and has historically invested heavily in rural infrastructure, so it is a strong alternative to Vodafone in the countryside. Its €20 prepay Simplicity plan includes unlimited 5G data with unlimited calls and texts, and entry-level prepay offers start from as little as €10.
GoMo and 48: The Budget Brands
GoMo is Eir's low-cost SIM-only brand and runs on the Eir network. Its headline plan is €14.99 a month for all calls, texts, and 5G data, with a "price for life" guarantee. It is a rolling 30-day deal rather than a tourist prepay, but it is one of the cheapest ways to get unlimited data if you are staying a while and can sign up online.
48 is a digital-only, eSIM-friendly brand on the Three network aimed at value seekers. Its unlimited data, 5,000 minutes, and 5,000 texts plan costs €12.99 every 4 weeks, with new customers often paying a promotional €6.50 for the first few cycles. With 90% 5G and 99% 4G population coverage, it is a great budget pick for data-hungry travelers comfortable signing up app-first.
Tesco Mobile
Tesco Mobile runs on the Three network and sells prepay SIMs at any Tesco supermarket. It is a handy backup if you are doing a grocery run and want a SIM in the same trip.
Ireland SIM Card Plans Compared
| Carrier | Data | Calls | Validity | Price | Best For |
|---|---|---|---|---|---|
| Three Prepay | All-you-can-eat (IE) | Free 3-to-3 + allowance | 28 days | €20 | Most tourists, UK border trips |
| Vodafone PAYG | Unlimited 5G | Unlimited | 28 days | €20 | Rural west-coast coverage |
| Eir Prepay | Unlimited 5G | Unlimited | 28 days | €20 | Rural backup to Vodafone |
| GoMo | Unlimited 5G | Unlimited | 30 days (rolling) | €14.99/mo | Longer stays, online signup |
| 48 | Unlimited | 5,000 min | 4 weeks | €12.99 (€6.50 intro) | Cheapest unlimited data |
Where to Buy a SIM Card in Ireland
Dublin Airport
Terminal 1 has a WHSmith near the security area, and Terminal 2 has a Spar that sells SIMs, along with convenience stores and kiosks across both terminals. Automated SIM vending machines run 24 hours a day in both terminals, so you can get connected the moment you land. No ID required.
Carrier Stores in the City
Three, Vodafone, and Eir all have stores on Dublin's main shopping streets like Henry Street and Grafton Street, and in towns nationwide. Staff speak English and can set the SIM up for you on the spot.
Supermarkets and Convenience Stores
Tesco supermarkets sell Tesco Mobile SIMs (on the Three network), and Spar, Centra, and other convenience shops stock prepay SIMs from the main carriers. Top-up vouchers are sold at the till almost everywhere.
Online Before You Fly
GoMo and 48 are digital-first brands you can order online or activate as an eSIM before arrival. This avoids the shop entirely, though you may need a card that works for Irish signup.
eSIM vs Local SIM Card in Ireland
| Factor | eSIM | Local SIM |
|---|---|---|
| Setup time | 3 minutes (before your flight) | 5–15 minutes at a shop |
| ID required | No | No (Ireland doesn't require it for prepay) |
| Price (7 days, 5 GB) | ~$5–8 (Airalo/Nomad) | €20 (includes far more data and calls) |
| Phone calls | Data only | Included with an Irish number |
| Best for | Short trips, data-only needs | Longer stays, need an Irish number or calls |
For most short-term visitors who just need data, an eSIM is the easiest and cheapest option and works the moment you land. But if you want an Irish phone number for booking B&Bs, calling restaurants, or being reachable by tour operators, a €20 Three or Vodafone prepay SIM is great value for a week or two.
Ireland-Specific Tips
Practical Advice for Staying Connected in Ireland
Ireland is in the EU: If you already have an EU SIM from another country, it works in the Republic of Ireland at no extra cost under Roam Like at Home. You do not need to buy an Irish SIM for a short hop.
Northern Ireland is the UK: Crossing into Belfast or the Giant's Causeway means leaving the EU. Three usually includes the UK at no charge, but other Irish SIMs may roam. Check before you cross.
West coast and islands: Vodafone has the most reliable rural coverage. If you are driving the Wild Atlantic Way, through Connemara, or out to the Aran Islands, Vodafone or Eir will keep you connected where others drop out.
Top-ups: Top up any Irish prepay SIM with cash vouchers sold at supermarkets and convenience stores, or through the carrier's app with a card.
WiFi: Hotels, pubs, cafes, and most tourist sites offer free WiFi, and many buses and trains have onboard WiFi too.
Frequently Asked Questions
Do I need my passport to buy a SIM in Ireland?
No. The Republic of Ireland does not require any ID, passport, or registration to buy a prepaid SIM card. You can walk into any shop, supermarket, or airport kiosk, pay with cash or card, and start using it right away. This makes Ireland one of the easiest countries in Europe for a tourist SIM.
Does a Europe-wide eSIM or SIM cover Ireland?
Yes, as long as the plan lists Ireland or the EU. The Republic of Ireland is an EU member, so any EU SIM works there at home rates under Roam Like at Home, and most Europe-wide travel eSIMs include it. Just double-check the coverage list, and note that Northern Ireland is separate.
Will my Irish SIM work in Northern Ireland?
Not automatically. Northern Ireland is part of the United Kingdom, not the EU, so it is outside the EU roaming zone. Three Ireland typically includes the UK and Northern Ireland in its prepay plans at no extra charge, which makes Three the best choice if your trip crosses the border. Other Irish SIMs may roam there, so confirm with the carrier first.
Which network has the best coverage on the rural west coast?
Vodafone has the strongest rural and west-coast coverage in Ireland, reaching about 99% of the population and performing best in places like Connemara, County Kerry, and the islands. Eir is a close second thanks to heavy rural investment. Three is excellent in cities and towns but can be weaker in the most remote areas.
Should I get an eSIM or a physical SIM for Ireland?
For a short data-focused trip, a travel eSIM is easier and cheaper since it installs before you fly and works the moment you land, with no shop visit and no ID. A physical prepay SIM from Three or Vodafone makes more sense if you want an Irish phone number for calls and texts or are staying a couple of weeks and want unlimited data for €20.