The Canary Islands are part of the European Union for telecoms purposes, so an Irish phone works here exactly as it does at home — while a UK phone depends entirely on which network you are with and which tariff you are on. Some British networks still include EU roaming at no extra cost; others charge a daily fee. There is no single answer, and the only reliable source is your own provider.
That is worth stating plainly because the islands' odd status confuses people. The Canaries sit outside the EU VAT area and outside the customs union, which is why the airport shops are genuinely duty-free — but they are an EU outermost region and fully inside EU telecoms law. For roaming, they are Europe. Nothing about being a thousand miles off Africa changes your bill.
So the job before you fly is small: find out what your tariff does abroad, turn on Wi-Fi calling, and decide whether an eSIM is worth the ten minutes. Do those three things and the whole subject disappears for the rest of the holiday.
Irish phones: nothing to do
Ireland is in the EU, and the "roam like at home" rules mean an Irish SIM uses your domestic call, text and data allowance in Spain at no extra charge. Calls back to Ireland from the Canaries come out of your ordinary minutes.
Two caveats. Unlimited-data plans carry a fair use roaming cap, usually a set number of gigabytes per month abroad, after which a small per-gigabyte charge applies — the figure is in your contract and your provider must tell you when you approach it. And the rules cover roaming, not international calls: ringing a Spanish number from your Irish phone while standing in Spain is an international call and may be charged as one, which catches people booking restaurants.
UK phones: check, do not assume
When the UK left the EU it left the roaming regulation with it. Providers were free to reintroduce charges, and they made different choices — some kept EU roaming inclusive on all or most plans, others brought in a daily fee of a few pounds for each day you use your phone abroad, and several treat pay-monthly, SIM-only, legacy and business tariffs differently from one another.
The result is that two people standing on the same beach with the same handset can be paying very different amounts. Do not rely on what a friend tells you, on what was true on your last holiday, or on a forum post. Open your provider's app, find the roaming section, and read what your specific plan says about Spain. Do it a week ahead, because some networks require you to switch roaming on for the account before you travel, and a few still bar it by default on newer contracts.
Ask three questions: is roaming included or is there a daily charge? What is the fair use data cap, and what happens past it? And are calls to UK numbers included, or only calls received? The last one is where surprise bills come from.
Whatever your answer, do the two safety steps: set a data spending cap in your account if your provider offers one, and turn off background app refresh and automatic photo backup before you land. A phone that decides to upload a week of 4K video over a metered roaming connection is the classic way to turn a ten-pound holiday into a hundred-pound one.
Wi-Fi calling is the underused answer
Almost every modern handset supports Wi-Fi calling, and almost nobody switches it on. With it enabled, calls and texts travel over the hotel or café Wi-Fi and are billed as if you were standing in your kitchen at home — your normal minutes, your normal texts, no roaming involved at all. It also solves the problem of a hotel room with thick walls and no signal.
Turn it on in your phone's settings before you leave, while you are still on your home network, because some providers only allow activation domestically. Then, in the Canaries, a call to a UK landline from a hotel room costs you nothing beyond the allowance you already pay for.
For everything else there is messaging. WhatsApp is not just an option in Spain, it is the default: restaurants take bookings on it, excursion companies confirm on it, and your apartment owner will message you on it rather than emailing. Install it if you have not.
eSIMs and local SIMs
If your UK plan charges for roaming and you want a fortnight of data, a local or travel eSIM is the cheap answer. Most phones sold in the last few years support one, and it means keeping your UK number active for calls while data runs over the Spanish profile.
- Travel eSIM providers sell data-only bundles for Spain or Europe that you buy online and activate by QR code before you fly. Prices for a week or two of a few gigabytes are generally in the single-digit euros. No paperwork, no shop visit.
- Spanish operators — Movistar, Vodafone, Orange, Yoigo and the low-cost brands — sell prepaid SIMs with generous data. Buying one requires showing your passport and being registered, which is a legal requirement in Spain rather than a formality, so allow twenty minutes in the shop. The airports and the main shopping streets have outlets.
- Check your phone is unlocked if you plan to use a physical SIM. eSIM sidesteps that problem entirely.
The fuller comparison, including hotel and public Wi-Fi and what the connection speeds are actually like, is on our page about SIMs and Wi-Fi in the islands. If you are coming to work rather than to sunbathe, the practicalities of fibre, co-working and mobile backup are covered for remote workers in the Canaries, which is a large and growing group.
Coverage: excellent, then suddenly not
Along the coasts and across the resorts, coverage is very good — 4G everywhere and 5G through the capitals, the airports and most tourist areas. You will get a signal on the beach, in the supermarket and on the motorway.
Then you drive inland and it vanishes. These are steep volcanic islands, and a mobile signal does not bend round a 600-metre cliff. The reliable dead zones are:
- The floor of any deep barranco — and Canarian roads spend a lot of time on barranco floors.
- The laurel forests of Anaga and Garajonay, where the terrain and the canopy combine.
- The inside of the Caldera de Taburiente on La Palma.
- Long stretches of the western coast roads and much of El Hierro.
- The many road tunnels, which is worth knowing if you are following satellite navigation — our page on driving here recommends downloading offline maps for exactly this reason.
Anyone planning a serious walk should assume no signal. Download the route offline, tell someone where you are going, and do not rely on a live map — the practical safety advice is on our page about hiking in the islands.
The 112 detail worth knowing
Here is the thing that genuinely matters if something goes wrong in a remote place. An emergency call to 112 does not use your network — it uses any network with a signal at that spot. If your own operator has no coverage but another Spanish operator does, 112 will still connect. It works with no credit, and on most handsets it works with no SIM at all.
So the fact that your phone shows no bars does not mean you cannot call for help. Try it. Spain also operates Advanced Mobile Location, which automatically sends the caller's GPS position to the emergency centre when you dial 112 from a modern smartphone — which on a mountainside you cannot describe is the difference between a rescue and a search. The Interior Ministry's AlertCops app does something similar and lets you share a location silently.
112 is free, works in English, and covers ambulance, fire, police and mountain and sea rescue across all seven islands. It belongs in your contacts alongside the practical advice on our health and safety page.
Dialling, and what the numbers mean
Spain's country code is +34, and Spanish numbers are nine digits with no trunk code — you dial all nine even from the house next door. Save every number in your phone in full international format (+34 followed by the nine digits) and it will work whether you are in Arrecife or at home.
The area prefixes tell you something useful. Canarian landlines beginning 922 belong to the western province — Tenerife, La Palma, La Gomera and El Hierro. Those beginning 928 belong to the eastern one: Gran Canaria, Lanzarote and Fuerteventura. It is a neat way to tell at a glance which half of the archipelago a restaurant, hire company or clinic is actually on, which matters when you are booking across islands. Mobile numbers start with 6 or 7 and carry no geography at all.
To ring the UK from here, dial +44 and drop the leading zero. To ring Ireland, +353 and drop the zero. And remember there is no time difference at all — the islands keep the same clock as London and Dublin all year, as our page on the Canarian time zone explains, which makes calling home simpler here than anywhere else in Spain.
The original island network
Worth a moment, because it is the loveliest footnote in Canarian communications. Long before any mast went up, the people of La Gomera solved the problem of talking across a deep ravine by whistling. Silbo Gomero encodes Spanish into whistles that carry several kilometres across terrain where, to this day, your handset shows no bars. It is taught in Gomeran schools and recognised by UNESCO — a functioning long-range communication system in exactly the places the mobile network still cannot reach.
Before you fly
Check your tariff's roaming terms, on both calls and data. Turn on Wi-Fi calling. Buy an eSIM if the sums favour it. Switch off automatic backups. Download offline maps for the island you are visiting. Save 112. And pack the right charger — the islands use standard European two-pin sockets, as our page on plug adapters notes, which is one more small thing to sort out at home rather than at an airport kiosk.