Spain doesn’t really have a true unlimited prepaid data SIM. What operators sell instead are very large data bundles, some going up past 300 GB, plus genuinely unlimited data on certain 5G contract plans.
If you want the closest thing to unlimited without signing a long contract, Lowi’s eSIM and prepaid options are a solid bet, especially thanks to data rollover and strong 5G coverage.
If you’re only in the country for a short trip, an eSIM is usually the fastest way to get connected the moment you land. Get connected in minutes:
Does Spain Have Unlimited Data SIM Cards?
No Spanish operator advertises a prepaid SIM with literally infinite data, since networks still need to manage traffic and fair use. What you’ll find instead are high-capacity data bundles designed to feel unlimited for normal use. Streaming, maps, social media, video calls, without technically being uncapped.
This is actually pretty common across Europe, not just in Spain. Genuinely unlimited data tends to live on contract plans with 5G, where operators can rely on a much larger and more predictable network capacity. On prepaid, the model is almost always «buy a big bundle of gigabytes» rather than «no limit at all».
The difference between high-capacity bundles and real unlimited data
A high-capacity bundle gives you a fixed, generous amount of data (say, 100 GB, 190 GB, or even 320 GB) that resets or tops up depending on your plan. Once you use it all, your speed usually drops or you need to top up again.
Real unlimited data, on the other hand, has no numerical cap at all: you can use as much as you want within the network’s fair-use policy, and this is typically only offered on 5G contract plans rather than prepaid SIMs.
For most travellers and everyday users, a large data bundle is more than enough. It’s only if you’re a very heavy data user. Think daily 4K streaming or constant hotspot sharing, that the difference between «huge bundle» and «truly unlimited» starts to matter in practice.
Prepaid vs contract: Which is better?
Prepaid SIMs are the easier choice if you’re visiting Spain temporarily, don’t want to commit to anything, and just need data and calls without paperwork. You pay upfront, use what you need, and top up when you run low, with no long-term obligation.
A contract plan makes more sense if you’re staying longer term, moving to Spain, or simply want the best possible value and genuinely unlimited data.
Lowi’s contract plans include real unlimited data on 5G, so if you know you’ll be in the country for months rather than weeks, it’s worth comparing the numbers before deciding.
Why Lowi is the Smartest Way to Get «Unlimited» Data
Lowi is a low-cost mobile and fibre operator in Spain, built around one simple idea: no hidden costs, no unnecessary commitments, and straightforward plans that actually make sense.
When it comes to data, Lowi combines large data bundles, real unlimited options on 5G contracts, and a few smart features that make your gigabytes go further.
Data Rollover: Your Data Never Dies
One of the simplest and most useful features is data rollover: any data you don’t use one month doesn’t just disappear, it carries over so you can use it later. If you have questions about how your specific data bundle works, you can check the details on Lowi’s data bundle FAQ.
This matters more than it sounds. Most people don’t use exactly the same amount of data every single month. Some months you travel less, some months more. So rollover means you’re not losing money on gigabytes you paid for but never got around to using.
5G Coverage on the Best Network
Lowi runs on one of the strongest mobile networks in Spain, with solid 4G and growing 5G coverage across cities and most travel routes. You can check exactly what to expect in your area on Lowi’s coverage map before you commit to a plan.
Good coverage is what actually makes a big data bundle useful in real life. A generous plan on a patchy network still leaves you stuck with slow connections in the wrong places, so it’s worth checking coverage for the specific cities or regions you’ll be spending time in.
Simple-Share
If you ever have extra data left over, Lowi lets you share it with another Lowi customer instead of letting it go to waste. It’s a simple way to help out a friend or family member who’s running low on gigabytes, directly from your own account.
You can find more details on managing your line and data through Lowi’s SIM support section.
This kind of flexibility is exactly what a low-cost, no-nonsense operator should offer: instead of losing unused data at the end of the month, you decide who benefits from it.
Best eSIM Options for Travelers and Expats
If you’re visiting Spain for a short stay, or you’ve just moved and don’t want to deal with a physical SIM card, an eSIM is usually the simplest solution. It’s a digital SIM profile you install directly on a compatible phone, without ever needing a physical card.
Instant Activation
The biggest advantage of an eSIM is speed: you can buy and activate Lowi’s eSIM online before you even land, and be connected the moment your plane touches down, without hunting for a store or queuing at the airport.
Global Compatibility
Most phones sold in the last few years support eSIM, including recent iPhones and many Android flagships. It’s worth double-checking your specific model is eSIM-compatible before you travel, since a small number of devices, especially older or region-locked ones, don’t support it yet.
Where to buy your SIM Card in Spain
If you’d rather have a physical SIM, or you want it ready before your flight, you’ve got a few different options depending on how much you want to plan ahead.
Buy online before you arrive (recommended)
Ordering online ahead of time is the easiest option: you choose your plan, pay online, and get it delivered or ready to activate. If you go this route with Lowi, you can check how and when your SIM card arrives so you know exactly what to expect and when you’ll be able to start using it.
At Madrid and Barcelona airports
Both major airports have mobile operator stores and kiosks where you can buy a SIM card on arrival. It’s convenient if you forgot to plan ahead, though it usually means slightly higher prices and the possibility of queues, especially right after a flight lands.
In city centre stores and supermarkets
Once you’re in the city, you’ll find SIM cards sold in mobile operator stores, some supermarkets, and convenience stores. This is a good backup option if you need one quickly and don’t want to wait for an online order to arrive.
What to Know Before Buying a SIM in Spain
Before you buy, a handful of practical details will save you time and confusion once you’re actually trying to get connected.
You’ll need your passport (ID verification required by law)
Spanish law requires ID verification to activate any SIM card, prepaid or contract. In practice, this means bringing your passport (or national ID if you’re an EU citizen) when you buy or activate your SIM, whether that’s in a store or through an online order.
EU roaming: your Spanish SIM works across Europe
If you’re travelling around Europe, a Spanish SIM card generally works under EU roaming rules, letting you use your data and minutes in other EU countries much like you would at home.
You can read more about how this works in Lowi’s roaming section and this complete guide to roaming.
4G vs 5G coverage: which areas have 5G in Spain?
5G coverage in Spain is strongest in and around major cities like Madrid, Barcelona, Valencia and Seville, while more rural areas still rely mainly on solid 4G. If you’re not sure what a SIM card actually is or how it differs from an eSIM, Lowi’s glossary entry on SIM cards is a quick, plain-language explainer.
Frequently Asked Questions about unlimited data SIM in Spain
Como tu operador SIMPLE, Lowi se especializa en brindar soluciones simples y eficaces en telecomunicaciones. Nuestro enfoque siempre se ha centrado en la innovación de nuestros servicios de fibra y móvil, así como en ofrecer la mejor atención para todos nuestros clientes. En este Blog, redactores especializados de Lowi compartimos nuestra experiencia en el sector tecnológico y de las telecomunicaciones, para mantenerte siempre conectado y al tanto de lo mejor del sector "techie" de una forma simple.
