Sorting your phone is a day-one job. You need an Irish number to apply for jobs, receive bank verification codes, and put on your PPS, rental and employer paperwork. The good news is that Ireland is easy: prepaid SIMs are sold widely, there is no government SIM-registration scheme and no residence-permit barrier, so you can be live on an Irish number within an hour of landing. This guide covers the networks, the budget brands, travel eSIMs for the moment you arrive, prepaid versus bill pay, and how EU roaming works once you are set up.
Ireland has three mobile networks: Three, Vodafone and Eir. Budget brands run on those same networks for less, including 48 and Tesco Mobile (both on Three) and GoMo (on Eir). For a newcomer, a prepaid SIM or eSIM is the easy default: no Irish bank account, no credit check, no address needed, and you can buy one over the counter or online with no fuss. Use a travel eSIM for your first day, then pick up a local SIM. Because Ireland is in the EU, your Irish plan also works across the EU and EEA under "roam like at home".
Three companies own the mobile networks:
Coverage from all three is broadly comparable in cities and large towns. Ireland has plenty of rural and coastal areas where signal thins out, so if you are heading somewhere remote for work, check that network's coverage map for the specific area before you commit.
Each network also sells through cheaper brands that use the same towers for less. These are worth knowing:
| Provider | Network | Type | Prepaid or bill pay | Notes |
|---|---|---|---|---|
| [Three Ireland](https://www.three.ie) | Three | Carrier | Both | Prepay and bill pay SIM-only; eSIM supported |
| [Vodafone Ireland](https://www.vodafone.ie) | Vodafone | Carrier | Both | Pay as you go (prepaid) and bill pay; eSIM supported |
| [Eir](https://www.eir.ie) | Eir | Carrier | Both | Prepay "Simplicity" top-up plans and bill pay |
| [48](https://www.48.ie) | Three | MVNO | Prepaid (rolling) | Online-first, aimed at younger users |
| [Tesco Mobile](https://www.tescomobile.ie) | Three | MVNO | Both | Sold in Tesco stores; Clubcard perks |
| [GoMo](https://www.gomo.ie) | Eir | MVNO | Bill pay (30-day rolling) | App and web only; one flat monthly price, no fixed contract |
A note on the labels: in Ireland, "prepaid" is usually called prepay or pay as you go, and "postpaid" is called bill pay. Brands like GoMo are technically bill pay because you pay monthly by card, but they run on a 30-day rolling basis with nothing to cancel, so they feel more like prepaid in practice. Compare on price and on how much data you actually get.
If your phone supports eSIM, you can step off the plane with data already working.
Travel eSIM. Providers such as Airalo and Holafly sell Ireland or Europe data eSIMs that you install before you fly, so you have data the moment you switch off flight mode. They are data-only (no Irish number) and cost more per gigabyte than a local plan, so treat them as a bridge for your first day or two, not a long-term plan. Vodafone also offers its own travel eSIM product.
Local eSIM. Three, Vodafone and the budget brands such as GoMo support eSIM, usually activated by scanning a QR code or through the provider's app. This means you can often get a proper Irish prepay number digitally without going to a shop.
You will still want a real Irish number quickly, because employers, banks and government services all expect one.
Prepay SIMs are sold at carrier stores, phone shops, supermarkets (Tesco Mobile in Tesco stores), convenience shops and online. App-based brands like GoMo are bought entirely online.
Ireland has no mandatory government SIM-registration scheme, so activation is quick. You choose a plan, insert the SIM or scan the eSIM QR code, and on some prepay plans you opt in to your chosen allowance by texting a plan code to the network (Eir, for example, uses an opt-in code by text). Do it somewhere with wifi.
Prices and allowances move around a lot and brands run frequent promotions, so check the live plan page rather than relying on any single figure. As indicative examples only: Three advertises SIM-only from around EUR 20 a month (indicative, provider pricing); Eir prepay advertises unlimited 5G data from a EUR 20 top-up (indicative, provider pricing); and GoMo advertises one flat price of EUR 14.99 a month (indicative, provider pricing). Confirm the current price and what is included before you buy.
For a working holiday, prepay (or a 30-day rolling plan like GoMo) is usually the better fit. It needs no credit check, no Irish bank account in many cases, and ties you to nothing, so there is nothing to cancel when you leave. Bill pay plans can require an Irish bank account or card and sometimes a credit check, and a 24-month contract can easily outlast your stay. If you settle in for the long term you can revisit it then. Either way, buy any handset outright rather than financing it on a long contract you will need to break.
Ireland is in the EU, so your Irish mobile plan works across the EU and EEA under the "roam like at home" rule, which means you generally use your home allowance of calls, texts and data when travelling in those countries at no extra charge, within a fair-use limit. This is set out in the EU roaming regulation (Regulation (EU) No 531/2012, as amended) and is reflected in Irish providers' own roaming terms. For example, GoMo includes EU roaming automatically with a data fair-use allowance, and Eir applies the regulated EU fair-use rules to its plans.
In practice this means a single Irish SIM covers you for weekend trips to the continent without buying anything extra, up to your plan's fair-use data cap. Roaming outside the EU and EEA (for example back home in Australia, New Zealand or Canada) is not included and is charged separately, so check your provider's non-EU rates before you travel further afield. The consumer regulator, the Commission for Communications Regulation (ComReg), publishes general consumer guidance on mobile services and roaming.
Your bank, email and government logins back home probably send verification codes to your old number. Before you fly, either move those to an authenticator app or put your home SIM on a cheap keep-alive plan. With a dual-SIM or eSIM phone you can run both at once: home number on one slot, Irish number on the other. Losing access to your home bank because the code goes to a dead number is a common and avoidable problem.
The emergency number in Ireland is 112 or 999 (both work for Garda, fire and ambulance). They work from any mobile, even without credit or your own network's signal. Source: Citizens Information: emergency services. Save it.
No, not for prepay. Ireland has no government SIM-registration scheme, so a prepay SIM or eSIM needs no proof of address, no Irish bank account and no credit check. Bill pay (postpaid) plans can ask for an Irish bank account or card and sometimes a credit check, which is why most newcomers start on prepay.
Budget brands on the same networks often undercut the carriers' own plans: 48 and Tesco Mobile run on Three, and GoMo runs on Eir. Prices and allowances change often, so compare the live plan page for data per euro rather than relying on any one figure.
For data on landing, use a travel eSIM from a provider such as Airalo or Holafly, which you install before you fly. For a proper Irish number, the networks and some budget brands (such as GoMo) offer local eSIMs you can set up by QR code or app once you are here.
Yes. Ireland is in the EU, so under "roam like at home" your Irish plan works across the EU and EEA using your home allowance, within a fair-use data limit, at no extra charge. Roaming outside the EU and EEA is charged separately, so check your provider's rates.
Prepay or a 30-day rolling plan suits most working holidaymakers: no credit check, often no bank account needed, and nothing to cancel when you leave. A 24-month bill pay contract can outlast your stay.
Carrier and phone shops, supermarkets (Tesco Mobile in Tesco), convenience stores and online. App-based brands like GoMo are bought entirely online. Airport stands are convenient but usually pricier than buying in town or online.
Verified on 23 June 2026 by the WHE research team. Source: citizensinformation.ie. How we verify →