You land at Dublin just after seven, the bus into the city leaves in twelve minutes, and the app that sells the ticket wants data first. Half the people in that queue are already paid up and do not know it. This guide sorts out who needs an Irish SIM and who does not, what eir, Vodafone and Three charge visitors in 2026, what the two terminals sell, and why eir publishes no eSIM route for prepay.
Who needs an Irish SIM, and who does not
Three different people land at Dublin. An EU phone roams on its home allowance and needs nothing. A UK phone on EE, O2, Vodafone or Three includes the Republic, so it needs nothing either. A US phone pays about $12 a day. That is the case worth solving.
| Where your plan is from | What Ireland costs you | Buy anything? |
|---|---|---|
| Any EU or EEA country | Your home allowance, under EU roaming rules | No |
| UK, on EE, O2, Vodafone or Three | Republic of Ireland included in your plan | No |
| UK, on giffgaff | Included, but only 5 GB of your data roams | Heavy users only |
| US, on AT&T or Verizon | About $12 a day, per line, per day used | Yes |
| Elsewhere, no roaming deal | Out of bundle rates, per MB | Yes |
Brexit never changed this for the big four. EE says data in the Republic comes out of your pay as you go allowance, though its pay monthly side lists a £2.29 daily Europe charge for plans that do not already include roaming, so check your plan name. Three UK keeps Ireland outside both its daily charge and its 12 GB fair use cap. Vodafone UK includes it for everyone up to 25 GB, and O2 puts it in its Europe Zone, also up to 25 GB. Only giffgaff stings: 5 GB of plan data, then 10p per MB.
Flying in from the EU or the UK? Buy nothingSwitch data roaming on before takeoff and get on with the trip. The rest of this page is for visitors from further away, and for UK plans that leave Ireland out.
What eir, Vodafone and Three charge a visitor in 2026
The market has settled on one shape. Around €20 buys 28 days of unlimited or near unlimited data on any of the three networks, with some calls. Below that, plans get short, small or data free.
| Plan | Price and length | What is in it |
|---|---|---|
| Three, Visit Ireland 5 GB | €15 every 7 days | 5 GB in Ireland and the EU, 50 Irish minutes |
| Three, Visit Ireland 25 GB | €25 every 28 days | 25 GB, 250 minutes and texts, 50 international minutes |
| Three, Super Surfer prepay | €20, 28 days | Unlimited Irish data, 30 GB EU roaming, 200 minutes |
| Vodafone, Data Unlimited 5G | €20 every 4 weeks | Unlimited 5G data, 100 any network minutes |
| eir prepay | €20, 28 days | Unlimited data, calls and texts, 45 GB EU roaming |
| eir prepay, small | €10, 14 days | Unlimited minutes and no data at all |
Three's seven day plan is the one nobody else writes about. For a long weekend, €15 with 5 GB and an Irish number beats paying for four weeks you will not use.
The eir figures come from eir's own prepay contract summary. An older eir price list splits that €20 differently, with a smaller roaming allowance, so read the plan card at the till.
Which network sells an eSIM to a visitor, and what eir really publishes
Two of the three. Three and Vodafone both sell eSIM to new customers online, ask for no Irish address, and can be set up before you land. eir publishes no eSIM route for prepay or for visitors at all.
On Three, a compatible handset activates the profile by itself, and everything else gets a QR code by email. Three's own FAQ confirms the part travellers care about: on a dual SIM phone you keep your home number beside the Three line. Vodafone Ireland says you can join on eSIM on pay as you go or bill pay, entirely online, before or after you arrive.
eir is where the roundups go wrong. Its eSIM page describes two routes only: a phone bought on an eir order, and a SIM only bill pay customer activating in the eir app with a 32 digit EID. Those are 30 day contracts from €14.99 a month plus a €9.99 activation fee, a deal for a resident. eir's prepay support has no eSIM entry at all.
If you want eir's network on an eSIM before you fly, a travel eSIM is the way in. Our Ireland eSIM runs on eir, supplier verified, and installs from a QR code at your kitchen table. It is data only, with no Irish number.
| Our Ireland plan | Valid | Price |
|---|---|---|
| 1 GB | 7 days | $1.29 |
| 3 GB | 15 days | $2.10 |
| 5 GB | 30 days | $3.33 |
| 10 GB | 30 days | $5.99 |
| Unlimited style | 7 days | $6.17 |
Our unlimited is not unlimited at full speedYou get 1 GB a day at full speed, then it slows until the next reset, every 24 hours. Fine for maps and messages, not for streaming a match. More in what unlimited really means.
Dublin Airport, terminal by terminal, and whether to wait
You can buy a physical SIM on arrival. You cannot buy a tourist eSIM there. Dublin Airport's facilities page lists SIM card sales powered by Sim Local in Terminal 1. Three sells at WH Smith in Terminal 1 and at Sim Local machines in both terminals, and Vodafone lists WHSmith plus machines in both.
The prices are traveller reporting, not airport policy. One travel guide checked in August 2026 put Lycamobile at €25 with €20 credit, Vodafone at €25 for 20 GB, and Three at €30 for 30 days unlimited, Terminal 1 only.
Vodafone warns you itselfVodafone Ireland's tourist page says plan prices may vary in Dublin Airport. When the operator admits that, treat every airport figure online as a ceiling.
So the counter costs roughly €5 to €10 more than the same network in town. It still wins in three cases: you need an Irish number, because some guesthouses and car hire desks only text a real Irish line, your phone takes no eSIM, or you landed with no patience. A US visitor on a day pass for nine days pays over $100, the sum worked through in the real cost of a day pass abroad.
Coverage on the Wild Atlantic Way and the Ring of Kerry
Dublin, Cork and Galway city are fine on all three networks. The argument starts on the west coast, where eir holds the strongest county figures.
| County | eir 4G | Vodafone 4G | Three 4G |
|---|---|---|---|
| Kerry | 100% | 93.9% | 62.5% |
| Galway, Connemara | 100% | 89.5% | 80.5% |
| Donegal | 100% | 90.3% | 65.4% |
| Clare | 100% | 89% | 73.2% |
That table comes from a coverage tracking site that publishes neither its source nor its update date, so read it as a direction, not a measurement. The same tables show Vodafone at 0% 5G in those counties, which looks like a hole in the data rather than reality.
The free fix takes a minute. ComReg, the Irish regulator, publishes an outdoor coverage map grading predicted 4G and 5G by Eircode for every network. Put in the Eircode of your guesthouse on the Ring of Kerry and you get an answer from a body with nothing to sell. eir claims 99% 5G population coverage, but population coverage flatters everyone here.
Calls, texts and whether you need an Irish number
Most visitors do not need one. WhatsApp covers family, restaurants and tour operators. The exceptions are places that only send a text: some guesthouses, some taxi firms, and your bank with a one time code.
If minutes matter, local plans carry them and travel eSIMs do not. Three's visitor plans give 50 or 250 Irish minutes, Vodafone's gives 100, and eir's €20 prepay gives unlimited calls inside a 3,000 fair use cap. The way round it is dual SIM: keep the home line on for codes, data roaming off, and put the data on the Irish eSIM. There is a walk through in keeping your home number on a second SIM.
Before you fly: the five minute version
Buying at home is what saves the arrivals queue. The plan page runs the full install screen by screen, so this is only the shape of it.
- Check the phone takes an eSIM and is not locked to a carrier.
- Buy and install on home Wi-Fi a day or two before the flight. Installing is not starting, so the clock waits.
- On landing, set the Irish line as your data line and turn its roaming on. Leave the home line on voice, data roaming off.
Quick answers
Can I buy a SIM card at Dublin Airport?
Yes. Dublin Airport lists SIM card sales powered by Sim Local in Terminal 1, and Three and Vodafone both list vending machines in Terminals 1 and 2, with WH Smith in Terminal 1 stocking SIMs. No tourist eSIM is sold at the airport.
Does eir have an eSIM?
eir offers eSIM two ways on its own site: with a phone bought from eir, and for SIM only bill pay customers activating in the eir app with a 32 digit EID. It publishes no prepay or visitor route, so tourists reach eir through a travel eSIM.
Can I use my US cell phone in Ireland?
Yes, if it is unlocked and on the right bands, but roaming is the costly part. AT&T's International Day Pass is $12 a day and Verizon's TravelPass is quoted at the same. Over nine days that is more than $100 for data you can buy for a few dollars.
How much does an Irish SIM card cost?
About €20 for 28 days is the market rate on all three networks, usually with unlimited or near unlimited data and some calls. Three sells a shorter €15 visitor plan with 5 GB over 7 days. Airport counters are reported at €25 to €30.
Is it better to buy a SIM card at the airport?
Only if you need an Irish number immediately or your phone cannot take an eSIM. Reported airport prices run €5 to €10 above the operator's list price, and a travel eSIM on eir costs a few dollars for a week.
Do I turn off my home SIM when I use an eSIM?
No. Leave the home line switched on so calls and bank codes still arrive, but turn its data roaming off. Set the Irish eSIM as the data line. Three Ireland's own guidance confirms visitors can keep the home number alongside a local eSIM.
- ✓Plans from $1.29, unlimited style from $1.29 a day
- ✓No airport counter, no queue in arrivals
- ✓Installed at home, live when you land at Dublin
- ✓Support answered around the clock
