Internet in Croatia: count your days before you buy roaming

A long weekend in Rome on a charging network costs you a few pounds you barely notice. A fortnight island hopping from Split is a different proposition: at £2.72 a day with EE, that is £38.08 before you have bought a single ferry ticket, and you will have burned through a chunk of your UK allowance doing it.

At the same time, Croatia is genuinely well connected. More than 98 percent of the populated territory has 4G, 5G is close to universal along the coast, on the motorways and in the main island resorts. This is not a country where you need a local SIM to function.

So the honest guide is a counting exercise, not a sales pitch. We worked out where each option overtakes the others, which network you actually want if your trip goes beyond the big islands, and the one thing no amount of money will fix: what happens to the network in Split and Hvar in August.

Why you actually need data in Croatia

The Croatian need is maritime logistics, which makes it quite different from Italy or Spain.

The first is the ferry. Moving between Split, Hvar, Brač, Korčula and Vis means living by timetables that shift with the season, the wind and the operator. Tickets are bought online, the fast catamarans sell out within hours in high season, and last minute changes are handled on a phone, never at a window.

The second is the bora. This northeasterly drops off the mountains without warning, closes bridges and cancels sailings. A live weather app is not a gadget in Croatia, it decides your day.

The third is accommodation. The country runs heavily on private rentals, the sobe and apartmani, with owners you reach on WhatsApp or Viber to arrange the keys. There is no hotel reception, so there is no plan B if you arrive at eleven at night in a Trogir alley with no data.

Add navigation in a very stretched country, the A1 tolls, and seafront car parks that only take app payments, and the need is real.

Solution 1: will your UK plan work in Croatia, and for how long?

Croatia sits in the same EU roaming zone as Italy for every UK network, so the daily rates are identical. What differs is how long you stay, and that is what decides the answer.

What each UK network charges you in Croatia

EE: £2.72 per day, 47 destinations, applies if you joined or upgraded after 7 July 2021. Fair use 50 GB, then roughly £3.69 per gigabyte. Resets at midnight UK time.

Vodafone: £2.75 per day, 52 destinations, applies after 11 August 2021. Fair use 25 GB, then £3.84 per gigabyte. Runs 24 hours from first use.

Three: £2.75 per day, free if you joined before October 2021 or are on a Value or Complete plan. Fair use 12 GB a month.

O2: free on all plans, 48 destinations, 25 GB cap only on plans of 25 GB or more.

giffgaff free with a 5 GB cap per plan. Smarty free to 12 GB a month. iD Mobile free, cap suspended since October 2024. Voxi needs paid passes, Lebara depends on the plan.

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Croatia’s mobile networks: a hierarchy that actually shows

Unlike Italy where all four networks are equally good, Croatia has a clear ranking, and it matters.

Hrvatski Telekom is the leader and the best coverage in the country, with around 95 percent 4G availability. This is the network you want if your trip includes the smaller islands or the mountainous interior. It sells prepaid under the Simpa brand.

A1 Hrvatska follows at roughly 87 percent, very good on the coast and in the cities. Its Tourist offer is the most visible in shops and kiosks.

Telemach brings up the rear at about 84 percent, with one useful quirk: it roams onto Hrvatski Telekom in rural areas, which claws back part of the gap.

None of this matters if you spend a week in Dubrovnik or Zagreb. It matters a great deal if you get on a boat to Lastovo.

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To help you decide between a physical SIM and an eSIM for your kind of trip, we built two small tools.

What a local SIM card really costs in Croatia in October 2026

Croatia joined the euro in 2023, so local prices are in euros with an approximate pound conversion.

Hrvatski Telekom sells unlimited data for ten days at around €11 (approx. £9.45), and, more interestingly, 120 GB valid for 90 days at €20 (approx. £17.15). That second one is the best value in the country for a long stay or repeat visits.

A1 sells a Tourist card at around €12 (approx. £10.30) with unlimited data, 100 minutes and 100 texts over ten days, and unlimited for thirty days at €29 (approx. £24.90). Note that EU roaming is not included in the Tourist card: it works in Croatia and nowhere else.

Telemach starts around €10 (approx. £8.60) for roughly 10 GB and 200 minutes, with ten to thirty day validity.

Buy on arrival or in advance: the three options compared

Holafly Croatia: the honest use case

Same position as Italy. We are not going to sell you an eSIM you do not need.

It makes sense if you are on EE, Vodafone or a charging Three plan for a trip under ten days. If you want a backup line while sailing, which is a serious argument when losing signal means not being able to reach the charter base. Or if you need your UK allowance kept intact for work.

It does not make sense if you are on O2, Smarty or iD Mobile, or if you are staying more than two weeks, where a monthly pass or a local SIM wins on price.

GET -5% OFF AT HOLAFLY WITH CODE LAPLANETEDECARO

Network coverage: where it works and where it struggles

August and the small islands, the real Croatian issue

Here is what genuinely sets Croatia apart from its Mediterranean neighbours, and it is neither price nor paperwork.

Croatia is a saturable country. The infrastructure is good, but it is sized for a nation of under four million and it absorbs an enormous seasonal influx every summer, concentrated on a narrow coastal strip and a handful of islands. In July and August, at peak hours, throughput collapses locally: around Diocletian’s Palace in Split, in Hvar harbour, along the busiest waterfronts.

This is not an operator problem. Changing SIM does not help, because every network shares the same overloaded masts in the same place at the same time. It is a constraint of place and hour, and the only real countermeasure is to shift your habits: make bookings in the morning, download maps the night before, and do not count on uploading video at nine on an August Saturday on the Riva.

The second issue is the small islands, and this is where the operator ranking stops being theoretical. On Hvar or Korčula all three networks work. On Lastovo, on Mljet, on the thinner populated islets, the gap between Hrvatski Telekom and the other two becomes very concrete. And it comes with a detail that matters here:

The travel eSIM sold for Croatia runs on Telemach and A1, not on Hrvatski Telekom. It is the same pattern as Kenya, where the travel eSIM runs on the number two while the leader is the only network covering the difficult ground. The logic is commercial rather than technical: aggregators rarely negotiate with a country’s first network.

So the recommendation is simple. If your trip is coastal and urban, Split, Dubrovnik, Istria and the big islands, an eSIM covers you perfectly. If the heart of the trip is the deep archipelago or the mountainous interior, the right answer is not a travel eSIM at all: it is a Simpa card from Hrvatski Telekom, around eleven euros for ten days unlimited, on the best network in the country.

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Where to go next

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So which option should you pick for Croatia?

Three lines, if we had to.

Count your days first. Under ten days on a charging network, take the daily fee or a travel eSIM. Ten days or more, buy EE’s Roam Abroad Pass at £25 a month or your network’s equivalent, it is cheaper than the meter. And if you are on O2, Smarty or iD Mobile, do nothing at all.

For two to three weeks, or if you are heading for the small islands, buy a Simpa card from Hrvatski Telekom on arrival. Eleven euros for ten days unlimited on the best network in the country, with nothing but a passport required, is the best value of the trip.

And if you want an independent backup line while sailing, the eSIM does that job, and the code LAPLANETEDECARO takes -5% off it.

If we have got the coverage wrong on an island you know well, tell us in the comments. On archipelagos, first-hand reports beat any table.

Fair winds, and keep an eye on the bora (it does not ask your opinion, and it does not consult the ferry captain either).