eSIM vs local SIM card: cheaper per gigabyte, costlier per hour

Ask anyone who travels often and you get a confident answer in both directions. The local SIM camp is right about the price. The eSIM camp is right about everything that happens around the price. Both are describing the same trip from different ends.

The comparison only becomes useful once you stop measuring it in euros per gigabyte and start measuring it in what the cheaper option asks of you.

What a local SIM really costs

The sticker price of a prepaid card in a local phone shop is often startlingly low, and it is genuine. What is not in that price is the path to reaching it.

You have to register, and registration is not a formality

A large share of countries now require prepaid SIM cards to be registered to an identified person before they will carry traffic. In practice that means handing over a passport, sometimes a visa or an entry stamp, sometimes a local address, occasionally a fingerprint or a photograph, and in a few places a local guarantor. Some countries process it in five minutes at a counter. Others need a second visit once the activation has cleared.

None of that is unreasonable, and none of it is visible in the price. It is also the part that varies most between countries, which is why advice from a friend who went two years ago is unreliable.

The airport is the expensive place to buy

Arrivals-hall kiosks exist because they sell convenience to people who have no alternative, and they are priced accordingly. The same operator's card in a city shop or supermarket frequently costs a fraction of the airport version, with a larger allowance. The traveller who goes into town first and buys the next morning gets the real local price. The traveller who lands at 23:00 with a taxi to find does not.

Topping up is where the plan breaks

Buying the card is the easy half. Extending it means navigating one of :

• an app in the local language, with a login tied to a local phone number you have just acquired,
• a USSD menu reached by dialling a short code and reading options in a script you may not recognise,
• a scratch card from a kiosk, with a code to enter correctly in a menu that times out,
• a payment method that may refuse foreign cards.

Any of these is fine with time and a little patience. None of them is fine at 07:00 on the morning of a connecting flight.

And the first hour is gone

Put together, a local SIM typically costs the first evening or the first morning of the trip : finding a shop that is open, queueing, producing documents, waiting for activation, and discovering whether data works before you rely on it. That hour has a value, and on a four-day trip it is a measurable share of what you came for.

What a travel eSIM costs instead

The eSIM side of the ledger is shorter, which is the point.

You pay more per gigabyte, usually noticeably more, because you are buying wholesale roaming repackaged rather than a domestic retail product. In exchange you get a profile installed before departure, working the moment the plane doors open, with no document to produce and no counter to find. Your home number stays live on the other line, so bank codes and booking confirmations still reach you, which a swapped-out physical card makes awkward.

The limitations are equally concrete. Most travel profiles are data only, so there is no local number for a restaurant to call back or a delivery app to verify. Allowances are modest compared with local prepaid bundles. And you are roaming, which means your speed and coverage depend on the partner network rather than on the best network in the country.

Side by side, honestly

Choose a local SIM when

The stay is long. Past roughly two or three weeks in one country, the price gap stops being theoretical and the setup hour amortises to nothing. For a month or a season, it is not a close call.

You need a local number. Rental platforms, delivery apps, bank verification, a tradesperson calling back, a taxi driver trying to find you : all of these want a number that looks domestic. Data-only profiles cannot do this.

You will use a lot of data. Tethering a laptop for a working month, or streaming in a rental with no broadband, is where local bundles are unbeatable.

You are going somewhere roaming serves poorly. In a few countries the networks that travel providers partner with cover the cities and not much else, while a local operator covers the interior. Where that is the case, buying locally is a coverage decision rather than a price one. Our country guides say which networks exist and how coverage is distributed.

You enjoy the errand. Genuinely. Some travellers like the phone shop, the conversation and the local SIM as a souvenir of arrival. That is a legitimate reason.

Choose a travel eSIM when

The trip is short. Under a week, the saving on a local card rarely exceeds the value of the hour it takes to get one, and the arrival is smoother.

You cross borders. Three countries in ten days means three cards, three registrations and three leftover balances, against one regional profile that lists all three.

You land late or leave early. A midnight arrival, an airport hotel, a 06:00 train : there is no open shop in that itinerary.

You need to stay reachable on your own number. Keeping the home line registered while data runs on the travel profile is the configuration that solves this, and it is the default on dual-SIM phones.

The paperwork is the obstacle. If registration in your destination needs a local address, a guarantor or a second visit, a profile you installed at home sidesteps the whole process.

The arrangement most experienced travellers end up with

Not one or the other, in sequence. Install a small travel eSIM before departure so the arrival works : the taxi, the map, the hotel message, the first evening. Then decide on the ground, with a working connection and no pressure, whether the stay is long enough to justify a local card. If it is, buy one in town at the real price rather than at the airport. If it is not, you already have what you need.

That order costs a few euros more than the purist local-SIM approach and removes every failure mode that makes arrival stressful, which is a trade most people make happily once they have made the other one badly.

Frequently asked questions

Related reading

What an eSIM is explains the chip and the profile, and how to choose an eSIM deals with the fields worth checking before you pay. If your current plan is roaming from home rather than either of these, roaming charges against eSIM pricing is the comparison that matters more.