The drive from Dubrovnik to Kotor is one of the classic day trips on the Adriatic: south along the Croatian coast, across the border into Montenegro, then around the Bay of Kotor to Perast and Kotor's old town. Your phone makes the trip too, and at the border it leaves the EU's Roam Like at Home area: Croatia is in it, Montenegro is not.
This guide explains what a Dubrovnik to Kotor day trip means for your mobile data, plus the Neum stretch on the coast road from Split, boat trips in the bay and the plan options.
Key facts for a Dubrovnik to Kotor trip
- EU roaming: Croatia is covered; Montenegro and Bosnia and Herzegovina are not
- One plan for all three: Europe Extended covers Croatia, Montenegro and Bosnia and Herzegovina
- Networks in Montenegro: Crnogorski Telekom, m:tel (depending on the plan)
- Emergency numbers: 112 in Croatia and Montenegro; police 192 in Croatia, 122 in Montenegro
- Embassies: in Zagreb and Podgorica; some countries cover Montenegro from a neighbouring capital
Dubrovnik to Kotor: what changes at the border
Croatia is an EU member, so an EU SIM works in Dubrovnik as at home. Montenegro is not in Roam Like at Home yet: the EU opened negotiations in June 2026 to bring the Western Balkans in, but until an agreement applies, your operator can charge roaming in Kotor at its own rates. Some operators already include Montenegro, so check your tariff.
With a SIM from outside the Roam Like at Home area, both sides are roaming unless your tariff includes them. Near the border, a phone can also connect to the strongest signal, even from the other country. 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 on the coast road from Split
If you start in Split, the coast road to Dubrovnik crosses a short stretch of Bosnia and Herzegovina at Neum. Since the Pelješac Bridge opened in 2022, drivers can bypass Neum, but phones near that coast can still pick up networks from Bosnia and Herzegovina, which is outside Roam Like at Home.
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. Europe Extended covers Bosnia and Herzegovina too.
Boat trips in the Bay of Kotor
Kotor, Perast and Budva are on Montenegro's coast, and the bay and Budva have good coverage. On boat trips the signal holds near the shore and fades further out, so download maps and tickets before you board.
Which plan fits your trip
For a day trip from Dubrovnik or a few days on both sides, Europe Extended plans cover Croatia, Montenegro and Bosnia and Herzegovina on one eSIM. If you are staying longer in Kotor or Budva, a Montenegro plan may fit better, but it works only in Montenegro and does not cover Dubrovnik; with an EU SIM, your home tariff covers the Croatian side.
Telcomia's standard plans are data only: no local number or SMS, 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 sharing the connection is allowed.
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.
- Download an offline map of the Bay of Kotor.
- Save both countries' emergency numbers, including Croatia's sea rescue number.
Consular protection: two countries, two sets of numbers
- In Croatia, 112 reaches all emergency services; 192 is the police, 193 the fire service, 194 an ambulance and 195 sea rescue.
- In Montenegro, 112 also works; 122 is the police, 123 the fire service and 124 an ambulance. Bosnia and Herzegovina uses the same three numbers.
- Embassies are in Zagreb and Podgorica, and some countries cover Montenegro from a neighbouring capital. 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 Montenegro or 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.
Montenegro travel-safety page →
Questions travellers ask about a Dubrovnik to Kotor trip
Does my EU plan work in Kotor?
Not under EU rules. Montenegro is outside Roam Like at Home, so your operator can charge roaming there unless your tariff includes it.
Will a Croatian plan work in Montenegro?
No. A Croatia plan is for Croatia, and a Croatian SIM is an EU SIM, so Montenegro is roaming for it too. For both countries on one eSIM, choose Europe Extended.
Do I pass through Bosnia on the way to Dubrovnik?
From Split, the old coast road does, at Neum; the route over the Pelješac Bridge bypasses it. Either way, your phone may pick up a Bosnian network along that coast.
Is there signal on boat trips in the Bay of Kotor?
Near the shore, yes: the bay has good coverage. Further out the signal fades, so download maps before you sail.
The short version
A Dubrovnik to Kotor day trip crosses from EU roaming into a country outside it. One Europe Extended eSIM covers Croatia, Montenegro and Bosnia and Herzegovina: install it at home, keep data roaming off on your home line and save 112 for both sides.
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