In short: An eSIM for students gives you internet as soon as you land, without having to go to a store or deal with residency paperwork: you buy the plan online, install it via QR before you leave, and activate data on your arrival day. You keep your Spanish number for the bank and university, and adjust your data plan to your budget each month.
Studying abroad for a semester, a year, or a summer changes lives, but your phone bill shouldn't ruin your budget. An eSIM for students gives you data from the minute you land, with no contracts, no deposits, and no need to visit a store in a language you don't yet master. In this guide, you'll see how to choose a plan based on your stay, how to keep your Spanish number, and how to spend little when every euro counts.
Why an eSIM if I'm studying abroad?
Because it connects you as soon as you land, without a deposit or paperwork. You buy the plan online before you leave, install it via QR, and activate data at your destination in 1 minute. You avoid your carrier's roaming charges, which skyrocket as soon as you leave the EU, and you don't have to rely on finding a local store with your passport.
For a student, the practical difference is enormous. A local SIM card in the country often requires a residency number, a local bank account, or even visiting a physical store with documentation you won't have in the first few weeks. The eSIM saves you that hassle and gets you up and running from the airport: you order a taxi, notify your family, and search for your accommodation without paying a cent in roaming fees. Plus, your phone still has your Spanish SIM inside, so you can have both lines active at the same time and decide which one uses data. If you're coming for a short course or an exchange, this flexibility is exactly what you need while you settle in.
Data: how many GB does a student need?
A student consumes more data than they think: video calls home, maps, tutorials, university apps, and streaming in their residence. If you have Wi-Fi on campus and in your apartment, a medium plan will suffice; if you're always connected on the go, aim high. This table gives you a realistic reference per profile.
| Student profile | Typical usage | Approximate GB per month |
|---|---|---|
| With Wi-Fi on campus and in apartment | Maps, chats, some video outside | 3-5 GB |
| Mixed daily usage | Social media, music, video calls | 8-15 GB |
| Very connected / no fixed Wi-Fi | Streaming, laptop hotspot | 20 GB or unlimited |
A trick: save streaming and large downloads for when you're on Wi-Fi and use mobile data only for essentials. If you share internet with your laptop for studying, consumption skyrockets, so in that case, a generous plan is better. If in doubt, apply these tricks to save data with your eSIM before deciding how many GB to buy.
Short stay, semester, or full course
The plan changes significantly depending on the duration of your stay. A two-week language course doesn't require the same as a nine-month Erasmus program. Think in terms of two axes: the plan's validity days and whether it's rechargeable so you don't have to buy a new one every month.
- Short stay (1-4 weeks): a daily plan is more than enough. Summer courses, language schools, or short internships.
- Semester (3-5 months): a long-term and rechargeable plan is better, or renew monthly. A rechargeable eSIM saves time and money here.
- Full course (9 months or more): consider combining an eSIM for the start and a cheap local SIM once you have residency and a bank account.
If your destination is Europe, check out plans designed for long stays, like the Europe eSIM, which covers several countries with a single purchase: ideal if you travel to nearby cities on weekends.
Keeping your Spanish number active
This is the main question: do I lose my number if I use a data eSIM? No. A travel eSIM gives you internet, but your Spanish number continues to work on the SIM you already have. Since your phone is dual SIM, you have both lines active at the same time and choose which one uses data.
This is very important for a student: the bank, your home university's app, and many services send you SMS codes to your Spanish number. If you leave your Spanish SIM receiving calls and SMS (even without data, to avoid roaming charges) and the eSIM handling internet, you won't miss out on anything. The key is to configure it correctly: data via the eSIM, calls and SMS via your home line. If you want to fully understand what your carrier covers and doesn't cover when you leave your Spanish line only for receiving, review what data roaming is: for bank verifications and university SMS, leave voice/SMS roaming activated only for receiving, which is usually free or very cheap.
Tip: before you leave, note down which apps send SMS to your Spanish number (bank, university admin). That way you'll know that SIM needs to keep receiving, even if the internet goes through the eSIM.
Budget: how to stretch every euro
The student budget rules. The good news is that you only pay for the GB you need, without fixed fees or commitments: check the current price of each plan before buying and compare it with what your carrier would charge you for roaming. These are the levers to spend less:
- Buy just enough GB. Don't pay for 20 GB if you have Wi-Fi in your apartment.
- Use Wi-Fi for heavy tasks. Downloads, series, and updates, always on Wi-Fi.
- Recharge instead of rebuying. A rechargeable plan avoids paying the fixed part again.
- Share with your laptop only when necessary. Hotspot is convenient but eats up data.
If you're looking for the most economical plan possible, first compare how much you really save with the eSIM vs. roaming guide and the international chip vs. eSIM comparison, which is very useful if you combine studies with weekend trips.
What almost no one tells you before you leave
There are details that don't appear in generic guides and that genuinely change a student's first week. Here are the important ones.
Your bank might block your app just for connecting from another country. Many Spanish banking apps flag access from a foreign IP as suspicious and will ask for extra verification, or simply close your session. This isn't a rare myth; it's standard security behavior. If you're going to handle important banking matters from abroad, check how a VPN for private travel works: it allows you to connect to the internet with a Spanish IP and avoid blocking, something almost no eSIM guide mentions.
Eduroam Wi-Fi isn't ready on day one. It requires your home and host universities to sync your account, and this can sometimes take one or two weeks after you formally enroll. If you rely solely on campus Wi-Fi, you might be left without anything just when you need it most: to find your classroom, sign up for classes with a deadline, or submit a form at the last minute. The eSIM covers exactly that gap for the first few days.
Not all "cheap" phones have eSIM. If you're considering buying a used phone as soon as you arrive to save money, first check if the model supports eSIM: many entry-level models, especially older ones or versions sold outside the European Union, only have physical SIMs. Check the exact model in your phone settings or on the manufacturer's website before buying a data plan.
When a travel eSIM is NOT convenient: if your course lasts more than a year and you already have a NIE (foreigner identification number) or residency number at your destination, it's almost always more cost-effective to switch to a local SIM with a flat rate as soon as you can open a bank account there. The eSIM is the best option for getting started without paperwork, but not necessarily for staying with it for twelve months.
Erasmus, internships, and end-of-course trips
Not all students travel the same way. Erasmus seeks long stays and multiple countries; an internship abroad requires a reliable number for work; and an end-of-course trip wants cheap data for the whole group for a few days. Adjust the plan to the scenario.
For an Erasmus student, prioritize multi-country coverage and long-term plans: you'll be moving around Europe and won't want to buy a different eSIM for every getaway. If your exchange is in Seoul or another South Korean university, keep in mind that eduroam is usually solid on campus but weaker in cafes and on the subway, so having a backup eSIM can save you more than one study evening. For internships, consider a plan with voice for work calls. And if the end-of-course trip is to the United States, the eSIM for the United States lets everyone have their own plan, without relying on carrier roaming or finding a store patient enough to explain the contract in another language. If you're traveling in a group, having everyone carry their own eSIM is more reliable than sharing a hotspot from a single phone: less battery drain and less dependence on who runs out of data first.
How to install it on the day you arrive
Installing the eSIM is a matter of a couple of steps and one minute. Do it with Wi-Fi before traveling to have everything ready and activate data only upon arrival at your destination. This way, you land already connected.
The process is simple: you buy the plan, receive a QR by email, scan it from your phone settings, and choose the eSIM as your data line when you arrive. With 24/7 Spanish-language support, if something isn't right, you have someone to ask in your language, which is appreciated when you're alone in another country. You can find the complete step-by-step guide on how to install an eSIM. A note for forgetful students: save the QR and activation code in a note or in the cloud, in case you need to reinstall the plan after a factory reset or a phone change.
Frequently asked questions
Do I lose my Spanish number if I use an eSIM?
No. A travel eSIM provides data, but your Spanish number remains active on your usual SIM. Since your phone is dual SIM, you keep both lines at the same time and decide which one uses data. This way, you continue to receive calls and SMS from home.
How many GB do I need for a semester abroad?
It depends on the Wi-Fi you have. With Wi-Fi on campus and in your apartment, 3-8 GB per month is usually enough. If you are always connected on the go or share with your laptop, aim for 15-20 GB or an unlimited plan. Start with just enough and recharge if it falls short.
Can I recharge the eSIM without buying a new one?
Yes, many plans are rechargeable: when the GB or days run out, you add credit without reinstalling anything. For long stays, this is the most convenient and cheapest option, as you don't pay the fixed part of the plan again.
Does the same eSIM work if I travel to other countries during Erasmus?
If you choose a regional plan (for example, for Europe), yes: a single eSIM covers several countries. This is ideal for weekend getaways during Erasmus. If you buy a single-country eSIM, it will only work in that destination.
Do I need to be a resident to buy an eSIM?
No. Unlike many local SIMs, they don't ask for residency, a local bank account, or for you to go to a store. You buy online with your email and activate it yourself, which is perfect for the first few weeks when you don't yet have destination paperwork.
Can I use the eSIM for online banking without my account being blocked?
It depends on the bank: some apps flag access from a foreign IP as suspicious and ask for extra verification or close the session. If you are going to carry out important banking transactions from abroad, consider using a VPN with a Spanish IP in addition to the eSIM, or notify your bank before traveling.
What if my phone doesn't have an eSIM?
If your model only supports a physical SIM, you won't be able to use a data eSIM: check compatibility in your phone settings or on the manufacturer's website before purchasing the plan. Most mid-to-high-end phones from recent years do include it, but some entry-level models or those purchased outside the European Union do not.
Conclusion
Studying abroad is already hectic enough without having to struggle with your phone. With an eSIM, you have data from the moment you land, you keep your Spanish number for the bank and university, and you adjust your spending to your student budget. Choose the plan according to the duration of your stay and have it installed before you leave. Prepare your connection with a PuraSim eSIM and focus on what's important: making the most of your course.
