Best eSIM for the Balkans 2026: Kosovo, Serbia, Bosnia and more without bill shock

First: the Western Balkans ≠ EU roaming. If you have an EU plan, your domestic allowance stops at the Croatian or Greek border. Beyond it, your operator's rest-of-world rate applies: without a data pass, tariff overviews show a price of around €1 to more than €10 per MB, depending on the operator (a single Instagram video can run into double figures). The EU has been negotiating with all six countries since June 2026 about bringing them into “roam like at home”, but there is no start date (as of October 2026). UK, Swiss and US plans aren't covered by EU roaming in the first place – there, all that counts is which countries your plan includes.

Second, the less well-known trap: many “Europe” eSIMs cover 30+ countries – but not necessarily the whole of the Western Balkans. Kosovo is the one most often missing: Airalo's Eurolink (more than 40 countries) includes the other five Western Balkan countries but not Kosovo – and Holafly's Balkan eSIM leaves Kosovo out as well. If you rely on “Europe” or “Balkan” in the name, you end up offline in Kosovo. Always check the country list.

Since 1 July 2021, the six countries have had their own roam-like-at-home agreement – a local SIM from Serbia generally also works in Bosnia and Kosovo with no roaming surcharge (with a limited roaming allowance, depending on the tariff).

The catch: this only applies to local SIM cards, not to travel eSIMs. For a long stay with time for a trip to a phone shop, it is a real option; for the journey there and for a multi-country trip, it isn't.

Holafly has a dedicated Balkan plan with unlimited data. According to the product page, it covers five countries: Albania, Bosnia and Herzegovina, Montenegro, North Macedonia and Serbia. Kosovo – the problem child for many providers – is not included, and Holafly currently lists its separate Kosovo eSIM as “not available” (as of October 2026). Unlimited data by the day: 3 days €18.50, 5 days €26.90, 7 days €33.90, 10 days €40.90, 15 days €59.90, 30 days €120.50 (around €4/day).

What users say: Trustpilot 4.7/5 from more than 114,000 reviews (as of October 2026); praised for the QR-code set-up and a stable connection in cities and tourist areas.

An honest caveat: Kosovo is missing. According to the product page, the hotspot is limited to 1 GB per day, and with very heavy use the network may temporarily throttle speeds under the fair usage policy (for one day at most, according to Holafly).

In plain terms: the code HERMESINVEST gets you 5% off all Holafly eSIMs – last checked on 16 July 2026. Details are in our discount guide (→ Holafly discount code 2026: save 5% with HERMESINVEST).

Regional eSIMs with GB bundles – cheaper for light users: according to the provider, Saily's Balkan eSIM covers nine countries, including all six Western Balkan countries with Kosovo (plus Croatia, Bulgaria and Greece): 1 GB/7 days US$5.99, 5 GB/30 days US$19.99, 10 GB/30 days US$32.99, 20 GB/30 days US$48.99, hotspot with no limit. Airalo's Eurolink (1 GB/7 days US$5) is valid in more than 40 countries, including five Western Balkan countries, but not in Kosovo – for that, Airalo has a separate Kosovo eSIM from US$5 (as of October 2026). With other providers, the rule is: check the country list.

Local tourist SIM: unbeatable for stays of several weeks (usable across the WB6), but it generally means registering with your passport in a shop.

Install your eSIM before you leave.

Switch off data roaming on your home SIM BEFORE you cross the border (otherwise your phone connects at high rates the very second you cross).

Turn on roaming alerts when you're in border regions.