The best eSIM for Ireland is Three, just not the one they sell tourists

I’ve had a SIM from every network operating in this country at some point, some by choice, some because a phone came locked to it and I couldn’t be bothered switching. So when someone visiting Ireland asks me what to sort before they land, I’ve usually got an actual answer.

When people ask what the best eSIM for Ireland is, there are really only two paths. You either buy a data eSIM from a company like Airalo, or an Airalo alternative before you fly, which runs on one of the local networks, or you buy directly from an Irish network once you’re here, as an eSIM or a physical SIM card. Airalo plans for Ireland run from around a fiver for a week of a few gigs up to about €25 for a month of unlimited data. Buying direct from an Irish network costs roughly the same, sometimes less, and that’s where this gets interesting.

Three is the network you want to be on. That bit isn’t controversial. What’s worth flagging is that the specific SIM Three markets at tourists doesn’t do what its own website implies, and the plan that actually gives you proper EU roaming is one nobody’s pointing visitors towards.

Why Three has the edge

Three was named Ireland’s best network by Opensignal in 2025, and it wasn’t close. Opensignal, which measures real user data rather than marketing claims, gave Three the wins for fastest network, fastest 5G, most reliable, and best overall quality, based on three months of actual usage data.

To be fair to the competition, eir picked up the win for 5G coverage and availability in Opensignal’s most recent report, covering the period up to January 2026. So if you’re heading somewhere remote where getting a 5G signal at all matters more than how fast that signal is, eir’s a genuine shout. For a normal visit hitting Dublin, Galway, Cork and the main tourist trail, Three’s speed and consistency win out, and that lines up with what I’ve seen using it myself.

Three’s tourist eSIM for Ireland has a catch

Three sells a dedicated tourist SIM called Visit Ireland, €15 for 5GB over 7 days or €25 for 25GB over 28 days, with instant eSIM setup. The product listing on Three’s own site says the data covers Ireland and EU. Scroll down to the terms and conditions on that same page and it says the opposite: the allowance is for use only in the Republic of Ireland.

That’s not a small print nuance, that’s a plan contradicting itself on its own product page. Buy Visit Ireland expecting it to keep working once you fly to Paris or drive north into Belfast, and you’ll find out the hard way that it doesn’t.

Buy the regular prepay SIM instead

Skip Visit Ireland and buy Three’s ordinary prepay SIM instead, specifically Connect Complete. It costs €25, tops up every 28 days, and gets you:

• Unlimited data in Ireland
• 37GB of genuine EU roaming data
• Unlimited minutes and 3,000 texts
• 5G included

That 37GB is a real, separate allowance with its own fair use policy, not a marketing line the small print quietly cancels. So why is nobody telling tourists about it? Probably because it’s not sold as a tourist product, so it never turns up in the usual SIM comparison round-ups. There’s nothing stopping a visitor buying it all the same. You’ll need a passport to register it, same as any prepay SIM in Ireland, and you’re better off buying it in a Three store or at the airport rather than trying to sort it from home, since it isn’t built for the order-online-before-you-land experience that Visit Ireland is.

One correction to my own assumption before this went out. I’d assumed Connect Complete might be physical SIM only, which would be a real headache for anyone with a US iPhone from the 14 onwards, since Apple dropped the physical SIM tray on those entirely. Turns out that’s not the case. Three’s had eSIM available across its prepay range since late 2023, Connect Complete included, you’ll just need to ask for it specifically in store rather than expecting the instant online activation Visit Ireland offers.

If you want the same network for less and don’t need the minutes, 48 is Three’s own budget prepay brand running on identical infrastructure, from around €13 a month. GoMo, eir’s equivalent, is bill pay only, so that one’s out no matter how good the price looks if you’re only here for a week.

Airalo is the easiest eSIM for Ireland if you skip the shop

Airalo is still the better call if convenience matters more to you than squeezing out every gigabyte. It partners directly with Three and eir for coverage, so you get the same network without a passport, a shop queue, or a confused sales assistant. It’s consistently the most recommended eSIM across r/irishtourism, and that tracks with what I’d expect given how it’s set up.

The trade-off is that some travellers on those threads found the data allowances stingier and the price per gigabyte higher than a local SIM gives you. If you’re staying more than a week or two, the maths starts favouring Connect Complete instead.

Don’t assume it works once you cross into the north

Do not take it for granted that your Irish eSIM or SIM keeps working once you cross into Northern Ireland, because plenty of the marketing claims about this floating around online don’t hold up. A good few of the generic “best eSIM for Ireland” articles out there claim their plans include UK roaming as standard, stated flatly with no source.

From personal experience I know Three will generally work without issue, across the UK and wider EU – which makes sense given the Common Travel Area, but current documentation just doesn’t spell it out for data. If a day trip north of the border is part of your plan, you should be grand, but I always recommend you download Google Maps data for the area you are visiting.

The Goosed verdict

If you’d rather everything just worked the second the plane door opens, get Airalo, you’ll be grand. If you’re staying more than a few days and want your data to survive a trip outside Ireland too, walk into a Three shop, ask for Connect Complete, and ignore the tourist SIM in the window. It’s not lying to you exactly, but it’s not telling you the whole truth either.

Connect Complete costs €25 for 28 days of unlimited Irish data and 37GB of EU roaming, available in any Three store or at Dublin Airport with a passport.

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