Most advice about studying abroad treats connectivity as a footnote: get a local SIM when you arrive. That advice is broadly right and badly timed, because in most countries you can't get a local plan on the day you land. Contracts want a local address you don't have yet, a bank account you can't open without the address, and sometimes a residence permit that takes weeks. So there's a gap, usually two to four weeks long, that falls at exactly the moment you most need to be reachable: finding your accommodation, registering at the university, opening the bank account, and telling your family you arrived. This guide is about covering that gap properly, working out what a semester actually costs, and being honest about the point where a travel eSIM stops being the right answer.
The gap nobody plans for
The first three weeks abroad are administratively dense and connectivity-hungry. You'll be navigating an unfamiliar city, filling in forms that need a phone number, coordinating with landlords and university offices, and doing all of it before you have any local infrastructure.
The instinct is to rely on Wi-Fi until you're settled. It works less well than people expect. University Wi-Fi often needs credentials you don't have until you've registered, accommodation Wi-Fi may not be connected when you arrive, and the moments you most need data are the ones spent outdoors between buildings.
A travel eSIM covers this window cleanly because it needs nothing from the country you're entering. No address, no bank account, no residence permit, no shop visit. It installs before you fly and works when you land, which is the entire requirement for the first few weeks.
Treat it as bridging infrastructure rather than a semester-long solution. That framing gets the decision right, and it also tells you how much to buy: enough for the gap, not enough for the year.
Why a local contract is hard to get on day one
The obstacles vary by country but rhyme. Postpaid contracts generally require proof of a local address, a local bank account for the direct debit, and identification that the carrier accepts. Some countries add a residence permit or tax number, and several require formal identity registration before a line can be activated at all.
Prepaid local SIMs are easier and are what most students eventually reach for in the short term, but they aren't friction-free either. Several countries require real-name registration with a passport at the point of sale, which means finding a shop, queuing, and having your documents with you. That's a task for week two, not for the taxi from the airport.
There's also a sequencing trap worth knowing about. In a lot of places the bank wants a phone number, and the phone contract wants a bank account. Arriving with a working number already in your pocket breaks that loop, which is a bigger practical advantage than it sounds.
None of this means you should avoid a local plan. For a full semester it is usually the cheaper answer, and it gives you a local number, which matters for the things covered further down. It just isn't available in the first week, and pretending otherwise is how people end up paying roaming charges by accident.
How much data a student actually uses
Student usage looks different from tourist usage, and the difference runs in both directions. You'll use more overall, because you're living somewhere rather than visiting: video calls home, streaming in the evenings, and a lot of maps in the first month. But you'll also spend most of your day on campus Wi-Fi once you're registered, which pulls the mobile number down sharply.
For the bridging period before campus access, budget generously. Heavy map use, video calls to reassure people at home, and no reliable Wi-Fi adds up faster than a normal trip. A few gigabytes a week is a realistic planning figure for those first weeks, more if you're video calling daily.
Once you're settled and on campus Wi-Fi, mobile use typically drops to messaging, maps, transport apps and music between buildings. That's a much smaller number, and it's the point where a cheap local prepaid plan starts to look obviously better value than anything bought as a traveller.
The practical approach is to buy for the phase you're in rather than the whole semester. Our thirty-day plans cover 201 destinations and almost all of them accept top-ups, so buying a moderate amount and adding more if the gap runs long beats guessing high in advance.
The setup most students land on
The arrangement that works is a bridge, then a switch, with your home number kept alive throughout on a separate line.
Before you fly, install a travel eSIM sized for three or four weeks. Keep your home SIM in the phone but turn its data roaming off, so your home number still receives texts while all your data runs over the travel plan. That combination gives you a working phone from the moment you land without any exposure to roaming charges.
Once you have your local address and bank account, get a local prepaid SIM or contract. You now have a local number for deliveries, verification codes from local services, and anyone who needs to call you in-country. At that point the travel eSIM has done its job.
Don't delete it immediately, though. If your plan still has data and validity left, it's useful for weekend trips to neighbouring countries where your new local plan may charge, and for the journey home at the end of term.
- Before you fly: install a travel eSIM, home line data roaming off
- Week one: use it for everything, keep your home number for bank codes
- Week two or three: local prepaid SIM once you have an address
- Later: keep the travel eSIM for trips outside your host country
- End of term: it still covers the journey home
If you're studying in Europe
Europe is the easiest case, and Erasmus students get a genuine structural advantage once they're set up locally. Under the roam-like-at-home arrangement, an EU or EEA resident on a local plan generally uses their domestic allowance across other member states, subject to fair-use limits. So a Spanish prepaid SIM bought in Madrid will usually work on a weekend in Lisbon at no extra cost.
That advantage only starts once you have the local plan, which brings you back to the same gap. Until then, a Europe-wide travel eSIM is the practical option, and there are several widths available depending on how many countries you expect to visit.
European plans are also where the longer validity options actually exist. Alongside the usual weekly and monthly terms, our Europe-wide catalogue includes 90 and 180-day options, which is unusual in travel data and genuinely useful for a semester that runs longer than a month.
One thing to check before you rely on it: if you're a UK student heading to the EU, or an EU student coming to the UK, roam-like-at-home does not bridge that border any more. Several UK carriers reintroduced EU roaming charges after Brexit, and the position varies by provider, so read your own tariff rather than assuming.
Keeping your home number alive
This is the part students most often get wrong, usually by cancelling their home plan to save money and then discovering what it was doing for them.
Your home number is attached to more than your friends. Bank verification codes, your home country's government services, two-factor authentication for accounts you set up years ago, and the number your family has for you in an emergency all point at that line. Losing it mid-semester is a genuinely difficult problem to unwind from another country.
The safe arrangement is to keep the home line active but switched to its cheapest possible state, with data roaming off, and let it do nothing but receive texts. Receiving a text doesn't require data roaming, so this costs you nothing while abroad and keeps every code arriving.
Better still, spend an hour before you fly moving two-factor authentication off SMS and onto an authenticator app. It removes your phone number as a single point of failure entirely, which matters more when you're twelve time zones from your bank's branch.
Being honest about the money
For a full semester, a local plan is almost always cheaper than travel data, and anyone telling you otherwise is selling something. Local carriers price for residents staying twelve months; travel providers price for convenience and short commitments. Those are different products with different economics.
Where travel data wins is the period when a local plan isn't obtainable, and that's a real cost too. Paying for a few weeks of prepaid travel data is straightforwardly cheaper than the alternatives, which are roaming on your home carrier at daily-pass rates, or spending your first fortnight tethered to unreliable Wi-Fi and missing messages from your university.
The comparison people forget is the home carrier's roaming pass. A daily fee looks small next to a monthly plan until you multiply it by twenty-one days of arrival admin, at which point it usually exceeds the cost of a travel plan several times over.
So the honest framing is narrow and specific: buy travel data for the bridge, buy local for the semester, and don't let anyone convince you to buy six months of travel data up front.
The week before you fly
Most of what makes arrival smooth is done at home, on reliable Wi-Fi, while you still have people around who can help.
The single most useful thing is to arrive with a working phone rather than a phone that needs setting up. Everything else follows from that.
- Install your travel eSIM at home, but don't enable it until you land
- Turn data roaming off on your home line, and leave the line itself on for texts
- Move two-factor codes from SMS to an authenticator app
- Download offline maps of your host city and the route from the airport
- Save your accommodation address offline, in the local language too
- Check whether your host country requires passport registration for local SIMs
- Tell your bank you're travelling, so the card doesn't freeze on day one
- Keep your eSIM order email accessible, not buried in an inbox you can't reach
Frequently asked questions
What's the best eSIM for studying abroad?
For the first few weeks, a standard travel data plan sized to three or four weeks, since that's the gap before a local plan becomes available. Look for one that accepts top-ups so you can extend if the paperwork drags. For a full semester, plan to switch to a local prepaid SIM or contract once you have an address and bank account, because local plans are cheaper over that length of stay.
Do I need a local SIM card if I'm studying abroad for a semester?
Eventually, yes, for two reasons. It's cheaper than travel data over several months, and it gives you a local number, which you'll need for deliveries, local app verification and anyone in the country who has to call you. But you generally can't get one on arrival, so a travel eSIM covers the period in between.
Can I get a phone contract as an international student?
Usually not immediately. Postpaid contracts typically require a local address, a local bank account for the direct debit, and accepted identification, and some countries also want a residence permit or tax number. Prepaid SIMs are far easier, though several countries require passport registration at the point of sale. Both are week-two tasks rather than day-one ones.
How much data does a student need per month abroad?
It splits into two phases. Before you have campus Wi-Fi, budget generously, since heavy map use and video calls home add up quickly and a few gigabytes a week is realistic. After you're registered and on campus Wi-Fi most of the day, mobile use drops sharply to messaging, maps and transport apps between buildings.
How do I keep my home phone number while studying abroad?
Keep the line active on the cheapest plan your carrier offers and switch its data roaming off. Receiving texts doesn't require data roaming, so the number stays reachable for bank codes and family at no roaming cost while all your data runs over a separate travel or local plan. Don't cancel it mid-semester without checking what's attached to it.
Will my bank's SMS codes still reach me abroad?
Yes, as long as your home line is still active and switched on. Receiving a text message doesn't require data roaming, so you can keep the number reachable while paying nothing for data on it. The safer long-term fix is to move two-factor authentication onto an authenticator app before you travel, which removes the dependency on your number entirely.
Is an eSIM cheaper than a local plan for a semester?
No, and it isn't meant to be. Local carriers price for residents on long commitments, so over four or five months a local plan almost always wins. Travel data is cheaper than the realistic alternatives during the weeks when a local plan isn't obtainable, which is the specific job it does well.
Can I use one eSIM across multiple European countries?
Yes, with a regional plan. Europe-wide plans cover a fixed list of countries from a single install, so weekend trips don't need anything new. Check the coverage list rather than the plan name, because the widths differ and the wider ones cost more for countries you may never enter.
What if I'm studying abroad for a full year?
Get a local plan as soon as you can, and treat travel data purely as arrival cover. Over a year the cost difference is substantial. Keep a travel eSIM installed afterwards for trips outside your host country, particularly if your local plan charges for crossing borders.
Can I top up an eSIM instead of buying a new one each month?
Usually yes, and it's the better approach while your arrival admin is unpredictable. Almost all of our thirty-day plans accept top-ups, which add data to the same eSIM with no reinstall and no new QR code, and the top-up's days are added to whatever days you had left.
Do I need a local number for deliveries and apps?
Often, yes, which is one of the main reasons to move to a local SIM rather than staying on travel data. Delivery services, local marketplaces, transport apps and some university systems expect a domestic number and may reject a foreign one. A travel eSIM is data-only and has no number at all, so it can't fill that role.
Does an eSIM work for Erasmus students travelling between countries?
Yes, and a Europe-wide regional plan is the straightforward option before you have a local plan. Once you do have an EU or EEA local plan, roam-like-at-home generally lets you use your domestic allowance in other member states under fair-use limits, so travel between countries costs nothing extra at that point.
What happens to my eSIM during semester breaks?
Nothing, unless its validity window runs out. A plan's days count down from first connection regardless of whether you're using it, so a plan bought for arrival will typically have expired long before a winter break. For trips during the year, buy a fresh short plan for the destination rather than expecting the arrival one to still be alive.
What should I sort out before I fly?
Install the eSIM at home but don't enable it until you land, switch data roaming off on your home line while leaving the line itself on for texts, move two-factor codes to an authenticator app, download offline maps of your host city, and save your accommodation address offline in the local language. All of it is easier on home Wi-Fi than in an arrivals hall.