Roaming, SIM cards and mobile data in the Canary Islands: what to watch out for
The short answer: in the Canary Islands you can call and use data just as you do at home. The islands are part of the European Union, the EU roaming rules apply here too, and their special tax status changes nothing about that. For a holiday of a week or two you do not need to switch anything on: according to the European Commission, your operator gives you roaming at domestic prices automatically.
There are two situations, though, where it pays to be careful. One is a longer stay: if you spend the whole winter here, your operator can warn you under its fair use policy, and in the end it can also charge a surcharge. The other is the sea: on a ferry, on a boat, even while walking around a port, your phone may connect to a satellite network, and the EU rules do not cover that.
In this article we go through what counts as permanent roaming, what to do if you get a warning, when it is worth buying a Spanish SIM card, and what to expect in the mountains. We wrote about offline maps and useful apps separately: The best travel apps for the Canary Islands.
The Canary Islands are part of the EU, and so is the roaming
It is a fair question, since the islands have a different tax system, and separate rules apply to customs too. According to the European Parliament, the Canary Islands are one of the EU's nine outermost regions, an autonomous community of Spain. The outermost regions are an integral part of the EU, and EU law applies fully on their territory. The EU has adapted its rules to their situation in only a few areas, including customs and tax policy.
One trace of this is the Spanish VAT law, which expressly excludes the Canary Islands from the harmonisation of turnover taxes. That has no effect on roaming. On the list of the Austrian telecoms regulator (RTR), the Canary Islands appear among the territories covered by the EU roaming rules, and the 2022 EU Roaming Regulation specifically requires the authorities to monitor roaming prices in the outermost regions too. We looked at the same question from the angle of the health insurance card: Do I need travel insurance for the Canary Islands?
So when you arrive, the same thing happens as in any EU country. Your operator has to tell you by text message that you are roaming, and remind you of its fair use policy. In an automatic message it also has to tell you that the 112 emergency number is free to call.
How long can you stay on your SIM from home?
The EU rules are meant for people who travel periodically. The European Commission defines roaming as travelling occasionally outside the country where you live, work or study, or with which you have some other stable link. As long as you spend more time at home than abroad, or use your phone more at home, you pay domestic prices. This is called fair use.
Your operator measures this over a longer period. Under the EU implementing regulation currently in force (2016/2286), it has to look at your presence and your usage together, over at least four months, and it has to state the length of this observation period in your contract. Every day your phone connects to the home network counts as a day at home. If, over the observation period, domestic presence or domestic use outweighs the rest, the regulation says this proves you are not abusing roaming.
So you can get a warning if two conditions are met together over those four months: you have spent more time abroad than at home, and you have used more roaming than you have used your phone at home. On top of that, your operator can ask you for proof that you live in its country or have a stable link with it.
What does this mean if you come for the winter? If you spend most of the four-month period on the islands, and use your phone more here in the meantime, both conditions may be met. The Commission itself advises anyone going abroad for months without a break to check their operator's policy in advance, and for six months of work abroad it suggests that a local SIM card is worth buying.
One more detail that matters even on a short trip: with unlimited or very cheap data plans, your operator can set a separate roaming data allowance, and it may be smaller than your allowance at home. It has to tell you about this in advance, and let you know when you reach it. That is why the Hungarian communications authority (NMHH) recommends checking your plan's roaming data allowance with your operator or in its app before you travel.
If you get a warning or a surcharge
A surcharge cannot be applied out of the blue. Under the implementing regulation, your operator first has to warn you, and give you at least two weeks to change your usage. According to Your Europe, the EU information site, you have 14 days after the warning to clarify your situation. If you start using your phone more at home within two weeks, you pay no surcharge; otherwise it can be charged from the date of the warning.
The amount of the surcharge is limited by an EU cap that has come down step by step over the years, so we do not give a figure here: you will find the current value on the Your Europe roaming page. When you roam, your operator also has to apply an automatic spending limit, which you can only go over if you ask to.
If you feel you were wrongly charged extra:
Complain to your operator first. It has to run a transparent, simple complaints procedure for fair use, and in it you can provide evidence that you only travel periodically.
Check your contract. According to the German Federal Network Agency (Bundesnetzagentur), the fair use policy first has to become part of your contract, so the exact conditions are in your contract documents.
If it is not resolved, go to the telecoms regulator in your home country. As a Hungarian subscriber, that is the NMHH: according to its complaints guide, you can request official proceedings, turn to the Media and Communications Commissioner, and in a billing dispute you can also go to the conciliation board instead of the courts.
As a German subscriber, you can write to the Bundesnetzagentur's consumer service if you could not sort it out with your operator. You will find the regulator for other countries in the list of BEREC members.
A Spanish SIM card: when it is worth it, and what you need
If you come for months, or work here, the roaming question does not even arise with a Spanish SIM card. EU roaming means being in a different member state from the one where your operator's network is. The Canary Islands are part of Spain, so on a Spanish operator's network you are not roaming here. The reverse is true as well: if you take the Spanish number home, that counts as roaming at home, and the same fair use rules apply to the Spanish operator.
With a prepaid card, expect to have to identify yourself. Under Spanish law (Ley 25/2007), operators that sell prepaid cards have to keep a register of their buyers' identities. You identify yourself with an identity document, and they record your name, your nationality, and the number and type of the document. So have your ID document with you when you buy.
If you work remotely from the islands, a stable internet connection matters at least as much. We wrote about it in our island-by-island guide for digital nomads, and you will find shared offices among our coworking listings.
eSIMs and travel data plans: check whose customer you become
With an eSIM, and with a travel data plan bought separately, the deciding question is the same: which operator's customer you become. The protection of the EU Roaming Regulation, that is, domestic prices, the information texts and the spending limit, applies to customers of an operator that provides roaming over a terrestrial mobile network in the EU.
The European Commission also warns that operators can offer an alternative roaming tariff outside the EU rules, but you have to choose it explicitly. Before you buy a plan or an eSIM, check which country's operator provides it, and what the terms say about roaming.
On ferries and boats: no EU prices on satellite networks
If you are taking a ferry to another island (we wrote about ferries and car hire in this article, and you will also find the ferry terminals among our listings), there is one thing to watch. The EU roaming rules only cover terrestrial mobile networks. While your phone is on a land network, in the port for example, nothing changes. But if it connects to the ship's satellite system, the EU rules no longer apply, and there is no price cap. According to the Bundesnetzagentur, an onboard network like this can be considerably more expensive.
The danger is that it can happen without you noticing, because near the coast your phone connects to the strongest network available by default. The NMHH even received a complaint from someone whose phone connected to a satellite network while they were walking around a port, running up roughly four million forints in data charges without their knowledge.
What you can do:
Switch your phone to airplane mode, or turn off roaming, while you are on board. The NMHH recommends this near ports too.
Set network selection to manual, so your phone does not jump to another network on its own.
Ask your operator whether it can block non-terrestrial networks. This is not always automatic. If your operator offers this kind of block, the regulation says you can ask for it at any time, simply and free of charge, and have it switched back on too.
Watch your text messages. Your operator also has to send you an information message when you connect to a satellite network.
In the mountains and in a barranco: coverage and emergency calls
The Spanish coverage figures sound good, but it is worth knowing what they measure. The report by the ministry responsible for digital affairs gives coverage as a share of the population, and the mobile coverage maps break it down to the level of a municipality, not to anything smaller, such as a trail or a barranco (ravine). On the ministry's maps you can also check what service is available at a given place. Before a hike, download the map for offline use; we explained how in our article on apps.
In an emergency, you can call 112 free of charge anywhere in the archipelago and in the surrounding waters, from any landline or mobile phone, and from the 112Canarias app too. If you need a doctor, we set out what to do step by step in our article Getting sick on holiday in the Canary Islands.
One feature is worth leaving switched on: ES-Alert. This is the Spanish civil protection system which, during a fire, a volcanic eruption or extreme weather, sends a message to every phone through the antennas in the affected area, with no app and no registration. According to 112 Canarias, tourists get it too if their phone is set up for it, and the setting is the same across the EU. On Android 11 and iOS 15.6 or later it is switched on by default.
The main language of the message is Spanish, but the issuer can choose a second language as well. For the 2026 test on Tenerife, the Canary Islands Government said that anyone whose phone is not set to Spanish may also receive it in English. The alert only arrives within signal range, not on a phone that is switched off or in airplane mode: if you switched to airplane mode on the ferry, turn it off again once you are ashore.
In short
The Canary Islands are part of the EU, so your SIM from home works here at domestic prices.
For a holiday you do not need to switch anything on, but check your roaming data allowance.
For longer stays your operator looks at at least four months: if you spend more time here, and also use your phone more here, it can warn you.
After a warning you have at least two weeks. For a surcharge, complain to your operator first, then to the regulator at home.
Take your ID document when you buy a Spanish prepaid SIM.
On the ferry and in port: airplane mode or manual network selection.
You can call 112 from any phone, and leave ES-Alert switched on.
Sources: European Commission, Your Europe: Roaming (2026-01-07) and its FAQ (2026-01-29); European Commission, Roam like at home FAQ; Roaming Regulation (EU) 2022/612 and Implementing Regulation 2016/2286 (Official Journal of the European Union, BOE); European Parliament, Outermost regions; Ley 37/1992 del Impuesto sobre el Valor Añadido and Ley 25/2007 (BOE); RTR (Austria), list of territories covered by the EU roaming rules (2020); NMHH (2023, 2024) and the Media and Communications Commissioner's guide; Bundesnetzagentur, EU roaming FAQ; BEREC; Ministerio para la Transformación Digital y de la Función Pública, Informe de Cobertura de Banda Ancha (2025, 2026); 112 Canarias and Gobierno de Canarias (ES-Alert, 2026).
Cover photo (cropped): a mobile phone mast on top of the cliff near Haría, Lanzarote, seen from the Mirador del Río viewpoint. Dguendel, CC BY 4.0, via Wikimedia Commons.
