You land, turn on your phone, and the familiar dilemma begins: how to get mobile data abroad without the bill ruining your trip. Between operator roaming, buying a local SIM, renting a pocket WiFi, relying on hotel WiFi, or installing a travel eSIM, there are many ways to connect, and almost all have their pitfalls. In this guide, we review them all, with real prices from 2026, their pros and cons, and tell you when each one is most suitable so you can choose wisely.
The problem of connecting away from home
The problem isn't a lack of options, but rather that each one solves a different scenario, and mixing them can be expensive. Within the European Union, the situation is comfortable: your plan works the same as in Spain thanks to the "roam like at home" regulation, so for a trip to Lisbon or Berlin, you don't need to do anything. The real headache comes when you cross a border outside the EU: the United States, Japan, Thailand, Morocco, Mexico, or the United Kingdom after Brexit. There, agreements between operators evaporate, and prices skyrocket.
Added to this is the pressure of wanting everything at once: maps so you don't get lost, a translator to understand the menu, messaging to let people know you've arrived, photos to the cloud, and if you work, email always on hand. All of that consumes data. The key is to decide before you leave how you're going to meet that need, because improvising at your destination almost always means paying more or being isolated while searching for a phone store with limited language skills. Let's go option by option so you arrive with your decision made.
Option 1: Your operator's roaming
This is the default and most convenient option: you don't have to do anything, your usual number remains active, and when you land, your phone automatically connects to a local network. The problem is the price outside the EU. Many Spanish operators charge for roaming usage between 6 and 18 euros per MB if you don't activate a package, which practically means that a single gigabyte can cost you hundreds of euros. To avoid this, almost all offer daily travel packages ranging from 5 to 15 euros per day with limited data, or plans up to 25-30 euros daily for unlimited consumption.
Let's do the math: two weeks in Japan with a 10 euro daily package is 140 euros just for data, and often with reduced speed after a certain consumption. Roaming wins in only one thing, absolute convenience, but you pay a very high price for it.
Practical rule: within the EU, your operator's roaming is perfect and free; outside the EU, it is almost always the most expensive option. If you are going beyond Europe, look for an alternative before you leave.
When it's suitable: short trips within the EU, or specific emergencies outside it. If you want to understand well how it works and when it activates, we explain it in what is roaming.
Option 2: Buy a local SIM
Buying a prepaid card from the country you visit is the cheapest option per gigabyte if you stay a long time in a single destination. A tourist SIM usually costs between 7 and 20 euros for one or two weeks with generous data, and the speed is the native local network, usually excellent. For a long stay of one to three months in a single country, no other option beats it in price per data.
The drawbacks are logistical and time-consuming. You have to locate a reliable point of sale as soon as you arrive, often at the airport where it is more expensive, identify yourself with your passport (many countries require registration), manually configure the APN and, above all, physically change your number: you temporarily lose your Spanish line for calls and SMS, precisely when your bank and apps send you verification codes. And if you take a multi-country trip, a local SIM from one country does not travel well when crossing the next border.
When it's suitable: long stays in a single country, backpackers for several weeks, or those who consume a lot of data and don't mind the hassle.
Option 3: Rent a pocket WiFi
A pocket WiFi (or MiFi) is a small portable router with its own data SIM that creates a network for several devices at once. Its great advantage is that a single connection is shared by phones, tablets, and laptops for the entire group, so if four or five people are traveling, the cost per person drops significantly. Rental usually ranges from 4 to 8 euros per day with unlimited data, and offers are available from 3.95 euros daily.
The price doesn't tell the whole story. You have to pick up the device before the trip and return it at the end (prepaid mail or airport counter), pay a deposit that can be up to 50% of the equipment's value, and charge another battery that runs out in half a day of intense use. If you lose or damage it without optional insurance, the penalty is around 80 to 150 euros. It's also another gadget to carry around, and if the group splits up, whoever doesn't have the router is without internet.
When it's suitable: families or groups of four or more people who travel together and consume a lot. For a single person, it almost never pays off.
Option 4: Rely on public WiFi
The "free" option: hotel, airport, cafe, or shopping center WiFi. For light and occasional tasks, it can save you in a pinch, but as a primary solution, it has two serious flaws. The first is coverage: you only have internet when you are physically within the network, so on the street, on public transport, looking for an address, or calling a taxi, you are disconnected precisely when you need it most.
The second is security, and it's serious. Public networks are usually unencrypted, making them easy ground for "man-in-the-middle" attacks, where an attacker positions themselves between you and the access point and captures what you send: emails, passwords, or bank details. Also, fake networks proliferate with names that imitate those of hotels or airports. The data is alarming: it is estimated that 25% of travelers experience some incident using public WiFi abroad, and 78% do not use a VPN when connecting. Airports and hotels are hackers' preferred targets.
Public WiFi is a useful complement, never your sole travel connection. If you use it, always do so with an active VPN and avoid online banking.
When it's suitable: as occasional support for large downloads at the hotel, always with a VPN. Never as a main plan.
Option 5: The travel eSIM
The travel eSIM is a digital card that installs on your mobile without any physical component: you buy a plan online, scan a QR code, and when you arrive, you have data instantly. It brings together almost all the advantages of the previous options without their drawbacks. You don't change your Spanish number, so you still receive calls, SMS, and verification codes while using data from the international plan; there's no device to pick up, return, or charge; and prices are a fraction of what classic roaming costs, with typical savings of 30% to 70%.
It also works across multiple countries: a single regional plan covers you when crossing borders, something impossible with a local SIM. Therefore, for the vast majority of travelers, the eSIM offers the best balance of cost, convenience, and speed. In the case of PuraSim, we cover 218 destinations with plans starting from $0.85, QR installation in 1 minute, hotspot function to share data, and 24/7 Spanish support, all without surcharges or surprises on your bill.
When it's suitable: almost always. Solo travelers, couples, short or multi-week trips, one country or several. If in doubt, this is your safe bet. We delve into how it works in what is an eSIM and why many already travel this way in internet without roaming: how to get it.
Comparison table and verdict
We summarize the five options in what really matters when looking for data: cost, convenience, and speed. This is a guideline with real figures from 2026; exact prices depend on your destination and operator.
| Option | Cost (outside the EU) | Convenience | Speed |
|---|---|---|---|
| Operator roaming | Very high (5-30 €/day or more) | Maximum: zero hassle | Good, sometimes capped |
| Local SIM | Very low per GB | Low: buy, register, change number | Excellent (native network) |
| Pocket WiFi | Medium (4-8 €/day + deposit) | Medium: pick up, charge, return | Good |
| Public WiFi | Free | Low: only within the network | Variable and insecure |
| Travel eSIM | Low (from $0.85) | High: QR in 1 minute | Excellent |
The verdict, except in very specific cases, is clear: the eSIM wins in the balance between the three variables. Roaming only pays off within the EU; a local SIM, for very long stays in one country; pocket WiFi, for large groups; and public WiFi, as support. If you want to thoroughly compare the two best alternatives, we break it down in eSIM vs portable WiFi and gather the best international plans in international eSIM. Ready to connect without hassle? Choose your eSIM according to your next destination.
Frequently asked questions
Do I need mobile data if I travel within the European Union?
You don't need to contract anything extra: due to the "roam like at home" regulation, your Spanish plan works in any EU country with the same gigabytes and no surcharge. The problem only arises when traveling outside the EU, where an eSIM or other alternative is advisable.
How much does it cost to use mobile data abroad outside Europe?
It depends on the option. Without a package, roaming can go from €6-18 per MB; with a daily package, between €5 and €30 per day. A local SIM card is around €7-20 for a week, a pocket WiFi €4-8 per day plus a deposit, and a travel eSIM starts from $0.85. The eSIM is usually the most cost-effective due to the convenience it offers.
Do I lose my Spanish number if I use a travel eSIM?
No. The eSIM coexists with your main SIM: you keep your usual number active for calls, SMS, and bank verification codes, while browsing with data from the international plan. This is one of its great advantages over buying a local SIM.
Is it safe to use hotel or airport WiFi?
Only with caution. Public networks are often unencrypted and are targets for attacks and fake networks. If you use them, always do so with an active VPN and avoid online banking. They are not reliable as your main travel connection: having your own data with an eSIM is much safer and more convenient.
Does my phone work with eSIM?
Most mid-to-high-end mobile phones from recent years are eSIM compatible: iPhone XS or later, Samsung Galaxy S20 onwards, recent Google Pixel models, and many others. Additionally, the phone must be unlocked by the operator. You can check this in your phone settings before purchasing your plan.
How long does it take to activate a PuraSim eSIM?
Very little. After purchase, you receive a QR code; you scan it, install the profile, and it's ready in approximately 1 minute. Ideally, install it before leaving home and let it activate when you land, to have data from the moment you arrive.
Conclusion
Getting mobile data abroad no longer has to be a gamble. Within the EU, your operator's roaming covers you at no cost; outside of it, the hierarchy is clear: roaming is the most expensive, a local SIM only pays off for long stays in one country, pocket WiFi makes sense for large groups, and public WiFi is a risky backup, never a primary plan. For everything else, which is most travel, a travel eSIM offers the best balance of price, convenience, and speed, without changing your number or carrying extra devices.
With PuraSim, you have 218 destinations, plans from $0.85, QR activation in 1 minute, hotspot, and 24/7 Spanish support. Choose your eSIM and travel connected from the moment you land. And if you're traveling within the European Union, always review the EU roaming rules to know exactly what your plan covers.
