Bosnia and Herzegovina
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The best Bosnia eSIM solves a problem most travellers hit at the border rather than before it: Bosnia is not in the EU, so roam-like-at-home allowances from a European SIM stop working the moment you cross — including on the short Neum coastal corridor that the Dubrovnik road passes through. Flysimio runs on BH Mobile, with solid 4G in Sarajevo, Mostar and along the main routes. Being straight about price: Bosnia is a more expensive data market than Serbia or Bulgaria, so our plans here are roughly double what we charge next door. We are still well under the unlimited-only alternatives for any normal allowance.

Getting online in Bosnia takes about two minutes. Confirm your phone supports eSIM — iPhone XS (2018) and newer and most Android flagships from 2020 qualify. Choose your Bosnia plan on Flysimio and pay with card, Apple Pay, or Google Pay; your QR code arrives by email within seconds. On Wi-Fi before you travel, open Settings → Cellular → Add eSIM (iPhone) or Network & Internet → SIMs → Add eSIM (Android) and scan it. The timing matters here: if you're driving in from Croatia, switch the Bosnian line on before you cross rather than after, so you're never briefly roaming at non-EU rates.

A week between Sarajevo and Mostar runs 2–3 GB for most travellers. Given the higher local pricing, the sensible approach is to buy 3 GB and top up rather than over-buying a large plan. Coverage is good in the cities and along the main roads: Sarajevo's Baščaršija and Austro-Hungarian centre, Mostar's Stari Most and bazaar, Jajce, Travnik, Blagaj and the Kravice waterfalls. It thins in Sutjeska and Una national parks and across the more remote parts of the country, so download offline maps before heading into the mountains.

Flysimio runs as a second line beside your usual SIM, so you keep your home number for calls and texts while your Bosnian data flows over the eSIM — standard dual-SIM behaviour on iPhone XS and later and most Android phones from 2018. Set the Flysimio eSIM as your cellular-data line and turn on Data Roaming for that line only, and turn it off on your home line — that matters more here than in most places, because an EU SIM left roaming in Bosnia is not covered by EU allowances. One serious safety note that outranks any of this: Bosnia still has uncleared landmines in some rural areas. Stick to marked paths and roads, heed demining signs, and never follow a map-app shortcut across open countryside.

Every Flysimio Bosnia plan includes mobile hotspot at no extra cost and without throttling, so you can tether a laptop or share with a travel companion. As a data-only eSIM it has no Bosnian phone number, but WhatsApp and Viber are both widely used across Bosnia and the wider Balkans, and FaceTime and Google Meet handle calls over data. Your home number stays reachable on your primary SIM. Bosnia uses the convertible mark (BAM), not the euro, so having maps and a currency converter working from the moment you arrive is genuinely useful.

Many visitors see Bosnia as a two- or three-day leg between Dubrovnik and Croatia's coast, and for that the 1 GB / 7-day plan is the right size. For a week taking in Sarajevo, Mostar, Jajce and the waterfalls, a 3 GB plan is the sensible buy. Because Flysimio gives you six months to activate, you can buy before you leave and validity only starts when your eSIM first connects in Bosnia. If your route also covers Serbia, Montenegro or North Macedonia — none of which are in the EU either — check whether a regional plan covers the whole trip before buying country plans one at a time.