Studying abroad for a semester, a year, or a summer is life-changing, but your phone bill shouldn't ruin your budget. A student eSIM gives you data from the moment you land, with no contracts, no deposits, and no need to visit a store where you don't yet speak the language. In this guide, you'll learn 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 leaving, install it via QR, and activate data at your destination in 1 minute. You avoid daily roaming charges of €10-20 from your carrier and don't depend on finding a local store with your passport.
For a student, the practical difference is enormous. A local SIM card in another country often requires a residency number, a local bank account, or even visiting a physical store with documents you might not have in the first few weeks. An eSIM saves you that hassle and gets you up and running from the airport: you can order a taxi, notify your family, and find 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 simultaneously and decide which one uses data. If you're on 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 uses more data than they think: video calls home, maps, tutorials, university apps, and streaming in their accommodation. If you have Wi-Fi on campus and in your flat, a medium plan will suffice; if you're connected on the go, aim high. This table gives you a realistic reference by profile.
| Student Profile | Typical Usage | Estimated GB per month |
|---|---|---|
| With Wi-Fi on campus and in flat | Maps, chats, some video outside | 3-5 GB |
| Mixed daily usage | Social media, music, video calls | 8-15 GB |
| Highly connected / no fixed Wi-Fi | Streaming, laptop hotspot | 20 GB or unlimited |
A tip: save streaming and large downloads for when you're on Wi-Fi and only use mobile data for essentials. If you tether your laptop for studying, consumption skyrockets, so in that case, a generous plan is better. If in doubt, calculate your actual usage with the guide on how much data you need before buying.
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 about 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 brief internships.
- Semester (3-5 months): a long-term and rechargeable plan is better, or renew monthly. Here, a rechargeable eSIM saves time and money.
- 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 30-day 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 remains active on the SIM you already have. Since your phone is dual SIM, you have both lines simultaneously and choose which one uses data.
This is very important for a student: your bank, your home university's app, and many services send SMS codes to your Spanish number. If you keep your Spanish SIM active for calls and SMS (even without data, to avoid roaming charges) and use the eSIM for internet, you won't miss anything. The key is to configure it correctly: data via the eSIM, calls and SMS via your home line. If you also want to make and receive calls and SMS with the eSIM, check the options for keeping your Spanish number and which plans include voice. For bank verifications, leave voice/SMS roaming activated only for receiving, which is usually free or very cheap.
Tip: before you leave, note which apps send SMS to your Spanish number (bank, university administration). This way, you'll know that SIM must keep receiving, even if the internet comes from the eSIM.
Budget: how to stretch every euro
The student budget is king. The good news is that eSIM plans start at very low prices (there are options from ~0.85 $ per GB in some destinations), and you only pay for what you need, with no fixed fees or commitments. Here are the levers to spend less:
- Buy just the right amount of GB. Don't pay for 20 GB if you have Wi-Fi in your flat.
- Use Wi-Fi for heavy tasks. Downloads, series, and updates, always on Wi-Fi.
- Recharge instead of repurchasing. A rechargeable plan avoids paying the fixed part again.
- Share with your laptop only when necessary. The hotspot is convenient but eats up data.
If you're looking for the cheapest plan possible, compare it first with the guide to best cheap eSIMs and with the options for cheap eSIMs for backpackers in Europe, very useful if you combine studies with weekend trips.
Erasmus, internships, and school trips
Not all students travel the same way. Erasmus students seek long stays and multiple countries; an internship abroad requires a reliable number for work; and a school 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 plans: you'll be moving around Europe and won't want to buy a different eSIM for every getaway. There's a specific guide for eSIMs for Erasmus students with the essentials. For internships, consider a plan with voice to answer work calls. And for a school trip, check the guide for eSIMs for school trips, where everyone has their own and no one is without GPS or their WhatsApp group. If you're traveling in a group and want to share a connection, review how a family eSIM for multiple devices works.
How to install it on the day you arrive
Installing an eSIM is a matter of a couple of steps and a minute of your time. Do it with Wi-Fi before traveling to get everything ready and only activate data 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's settings, and choose the eSIM as your data line when you arrive. With 24/7 Spanish support, if something doesn't work out, you have someone to ask in your language, which is appreciated when you're alone in another country. You have the complete step-by-step guide on how to install an eSIM. A note for a forgetful student: 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 the phone is dual SIM, you keep both lines active simultaneously 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 flat, 3-8 GB per month is usually enough. If you're connected on the go or share with your laptop, aim for 15-20 GB or an unlimited plan. Start with a modest amount and top up if it's not enough.
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, it's the most convenient and cheapest option because 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 a visit 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 papers for your destination.
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 length of your stay and install it before you leave. Prepare your connection with a PuraSim eSIM and focus on what's important: making the most of your course.
