Mostar, with its Old Bridge, is a popular day trip from Dubrovnik and Split, and some travellers continue inland to Sarajevo, the capital. Your phone crosses the border with you, and there it leaves the EU's Roam Like at Home area: Croatia is in it, Bosnia and Herzegovina is not.
This guide explains roaming in Bosnia and Herzegovina on a Mostar day trip from Dubrovnik or Split, the Neum stretch, the plan options and what to save before a trip inland.
Key facts for a Mostar and Sarajevo trip
- EU roaming: Croatia is covered by Roam Like at Home; Bosnia and Herzegovina is not, though negotiations opened in June 2026
- One plan for both: the Europe Extended plan covers Croatia and Bosnia and Herzegovina; the Europe plan does not cover Bosnia and Herzegovina
- Emergency numbers: 112 in Croatia; in Bosnia and Herzegovina, police 122, fire 123, ambulance 124
- Embassies: in Zagreb for Croatia and in Sarajevo for Bosnia and Herzegovina
Mostar day trip: roaming in Bosnia and Herzegovina
An EU SIM works as at home on Croatian networks. Bosnia and Herzegovina is outside Roam Like at Home: in June 2026 the EU opened negotiations to bring the Western Balkans in, but until an agreement applies, your operator can charge roaming in Mostar at its own rates.
Visitors with a SIM from outside the Roam Like at Home area usually pay roaming in both countries unless their tariff includes them. Near the border, a phone can also connect to the strongest signal, even from the other country, so if you use your home line in Croatia, switch mobile data to the eSIM and turn data roaming off on your home line before the border.
Neum: the Bosnian stretch of the coast road
The coast road between Split and Dubrovnik crosses a short stretch of Bosnia and Herzegovina at Neum. Since the Pelješac Bridge opened in 2022, drivers can bypass it, but phones along that coast can still pick up a Bosnian network.
On a home SIM or a Croatia plan, set network selection to manual in your phone's mobile settings and pick a Croatian network for that stretch. With the Europe Extended plan, a Bosnian network there stays within the plan.
Sarajevo and the road inland
Mostar, Sarajevo and the main roads are well covered, while mountain areas are patchier. Before a trip inland, keep on your phone what you would need without a signal: offline maps, your accommodation's address, the address and phone of the embassy responsible for you, and the local emergency numbers, which differ from Croatia's.
Before hikes or drives off the main roads, read the Bosnia and Herzegovina travel-safety page.
Which plan fits your trip
For a day in Mostar or a few days in Sarajevo, the Telcomia Europe Extended plan covers Croatia and Bosnia and Herzegovina on one eSIM, among 56 destinations. If you are staying longer inland, a Bosnia and Herzegovina plan may fit better, but it works only there and does not cover the Croatian coast; with an EU SIM, your home tariff covers Croatia.
Standard plans are data only, with calls through apps such as WhatsApp; the plan details show the Activation line, which gives the start of the validity period, plus the duration, the data and whether you may share the connection.
Before you leave
- Install the eSIM at home on Wi-Fi and keep it until the trip ends; some eSIMs can be installed only once.
- Make the eSIM your mobile data line, with data roaming on for it and off for your home line.
- Find manual network selection in your phone's settings, for the Neum stretch.
- Check whether your home tariff includes Bosnia and Herzegovina.
Consular protection: different numbers across the border
- In Croatia, 112 reaches all emergency services; 192 is the police, 193 the fire service and 194 an ambulance.
- In Bosnia and Herzegovina, 122 is the police, 123 the fire service and 124 an ambulance.
- Embassies are in Zagreb and Sarajevo. The Telcomia app shows which mission is responsible for you, with address and phone.
- If you are an EU citizen and your country has no embassy or consulate in Bosnia and Herzegovina, the embassy of any other EU country must help you on the same terms as its own nationals (Article 23 of the Treaty on the Functioning of the EU).
- The app keeps key emergency phrases ready to show on screen, including Croatian.
Bosnia and Herzegovina travel-safety page →
Questions travellers ask about a Mostar day trip
Does EU roaming work in Mostar?
Not under EU rules. Bosnia and Herzegovina is outside Roam Like at Home, so your operator can charge roaming in Mostar unless your tariff includes it.
Will a Croatia plan work in Bosnia?
A Telcomia Croatia plan is for Croatia, and a Croatian SIM is an EU SIM, so it pays roaming in Bosnia and Herzegovina unless its tariff includes it. For both countries on one eSIM, choose the Europe Extended plan.
Do I pass through Bosnia on the way to Dubrovnik?
From Split, the coast road does, at Neum; the route over the Pelješac Bridge bypasses it. Either way, a phone can pick up a Bosnian network along that coast.
Which emergency numbers work in Bosnia and Herzegovina?
122 for the police, 123 for the fire service and 124 for an ambulance. Save them before you cross, as Croatia's numbers are different.
The short version
A Mostar day trip leaves EU roaming at the border, and the coast road at Neum can do the same for your phone. The Europe Extended plan covers Croatia and Bosnia and Herzegovina on one eSIM: install it at home, keep data roaming off on your home line and save 122, 123 and 124.
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