Ireland and the United Kingdom are very often visited together: a flight to Dublin, a ferry to Wales, or a hop to London and Edinburgh. The problem is that, after Brexit, the UK is no longer part of the EU, and roaming has become expensive again. An eSIM for Ireland and the United Kingdom solves the two islands with a single plan and fixed price. We explain it to you.
Why a joint Ireland + UK plan?
Because they are two different countries with two different situations: Ireland is in the EU and the United Kingdom is not. A joint plan covers both with data in Dublin, Belfast, London, or Edinburgh without you having to buy two eSIMs or worry about which network to use at any given time. It is the most convenient option for a trip that combines Ireland and the United Kingdom.
The eSIM automatically connects to the local operator in each area. When crossing from the Republic of Ireland to Northern Ireland (which is the UK) or flying to Great Britain, the data continues to work without you lifting a finger. A single QR, a single price, zero in-route management.
Brexit and roaming in the United Kingdom
Since Brexit, the United Kingdom is no longer covered by the EU's "roam like at home" regulation. This means that many Spanish operators have reintroduced charges for using data in British territory, with rates that can be around €10-20 per day. Northern Ireland counts as the United Kingdom for roaming purposes, even if you share an island with Dublin.
This is where a travel eSIM clearly wins: you pay a fixed price for the GBs you contract and forget about bill surprises. If you want the details of how this works, we have a specific guide on whether there is roaming in the United Kingdom that is worth reading before traveling. And to understand the fundamental difference, check out eSIM vs roaming.
Practical tip: check your Spanish operator's roaming conditions for the United Kingdom before you leave. Many no longer include the UK in the European flat rate, and a weekend in London can cost you more in data than the flight.
Coverage in Ireland
Ireland has a modern network. Dublin, Cork, and Galway have plenty of 4G, with 5G expanding in urban areas. For moving around the city, using maps, or making video calls, you won't notice any limits. In the countryside (Ring of Kerry, Connemara, cliffs), there are weak spots, so download offline maps if you're taking a road trip.
If Dublin is your base, our eSIM in Dublin guide will be useful, with specific recommendations for consumption and areas. And for the entire island, the eSIM for Ireland goes into more detail by region.
Coverage in the United Kingdom
The United Kingdom has some of the best coverage in Europe. London, Manchester, Birmingham, Edinburgh, and Glasgow enjoy strong 4G and 5G. In the Scottish Highlands, rural Wales, or the English countryside, the signal drops, but main roads and towns usually have data.
London is probably your main stop; to make the most of it, the eSIM in London guide gives you tips on consumption in the subway and museums. If you go north, the eSIM for Scotland covers the particularities of the Highlands.
Local operators in both countries
The plan relies on the leading networks in each country to maximize the signal:
| Country | Main operators | Roaming situation |
|---|---|---|
| Ireland | Vodafone, Three, Eir | EU (roam like at home) |
| United Kingdom | EE, O2, Vodafone UK, Three UK | Outside the EU (Brexit) |
You don't choose the operator: the eSIM connects to the best one at each point and switches automatically when crossing from one country to another. This automatic management is precisely what avoids the hassle of having to understand the different roaming rules on each side.
Recommended data and activation
Calculate your GBs based on the number of days you'll be away and your usage. As a reference:
- Weekend in Dublin + London: 2-4 GB.
- One week between both countries: 5-8 GB.
- Two weeks with video and video calls: 12-20 GB or renewable plan.
Installation is done at home with Wi-Fi and takes about 1 minute: buy the plan, scan the QR in Settings → Mobile Data → Add eSIM, keep your usual SIM for calls, and activate data upon landing. If it's your first time, the guide on how to install an eSIM will walk you through it step-by-step.
Frequently asked questions
Does Northern Ireland count as the UK or as Ireland?
As the United Kingdom for mobile network and roaming purposes, even though it shares the island with the Republic of Ireland. That's why a joint Ireland + UK plan is so practical: it covers Belfast (UK) and Dublin (EU) without you having to worry about the border.
Will I be charged extra roaming in the UK with this eSIM?
No. With the eSIM, you pay a fixed price for the contracted GBs, including use in the UK. That's its advantage over your Spanish operator's roaming, which, after Brexit, usually applies daily rates for using data in British territory.
Does data continue to work when crossing between the Republic of Ireland and the United Kingdom?
Yes. The eSIM automatically switches to the local operator when crossing from one country to another, whether by land (border with Northern Ireland) or by plane to Great Britain. You don't have to reinstall anything or buy a second plan.
Is it for calls or just for data?
It's a data plan. For talking, you use WhatsApp, FaceTime, or internet calls, which work wonderfully with the eSIM's connection. This is what most travelers use and is usually much cheaper than conventional roaming calls.
Can I buy it if my phone already has another eSIM installed?
Yes, as long as your model supports multiple eSIM profiles, which is common in iPhones and recent Android phones. You can have several saved and only activate the one for this trip. Check first if your phone is compatible with eSIM technology.
Conclusion
Combining Ireland and the United Kingdom is a classic plan, but Brexit has put a price back on British roaming. With a single plan, you get data in Dublin, Belfast, London, and Edinburgh, a fixed price, and activation in 1 minute. Prepare your eSIM for Ireland and the United Kingdom before you fly and travel between the two islands without looking at the bill.
