Vienna, Bratislava, Budapest and Prague make one of Europe's classic city loops: palaces, coffee houses, the Danube, thermal baths and Prague's trams. Trains link the four capitals, and at every border your phone moves to another country's networks. An EU SIM roams at home prices in all four; a British, American or other non-EU SIM usually pays roaming unless its tariff includes Europe.
This guide to an eSIM for Vienna, Budapest, Prague and Bratislava explains who is already covered, what everyone else needs, how the phone behaves on trains and on the Danube, and what to set up before the first border.
Key facts for the Vienna, Budapest, Prague and Bratislava loop
- EU roaming: Austria, Hungary, Czechia and Slovakia are all covered by Roam Like at Home
- One plan for the route: the Europe plan covers all four countries
- Local networks: A1, Three and T-Mobile (Magenta) in Austria; One, Telekom and Yettel in Hungary; O2, T-Mobile and Vodafone in Czechia; O2, Orange and Telekom in Slovakia (depending on the plan)
- Emergency numbers: 112 in all four countries
- Embassies: in Vienna, Budapest, Prague and Bratislava
Who needs an eSIM for Vienna, Budapest, Prague and Bratislava
With an EU SIM, all four countries count as home for roaming. A travel eSIM only helps if your tariff includes little data abroad.
UK SIMs have not been covered by Roam Like at Home since 2021, although some UK operators include EU countries voluntarily, so check your tariff. SIMs from the US, Canada, Australia and elsewhere usually pay roaming in all four. For them, one Europe plan on an eSIM covers the whole loop, while the home SIM keeps your own number.
On the train between the capitals
As the train crosses a border, the phone hands over to the next country's networks. With an EU SIM or the Europe plan nothing changes, but a country plan does not cover the next country.
In Austria the signal holds on the main lines, with gaps in long tunnels, so save your tickets on the phone before boarding.
On the Danube
The Danube links Vienna, Bratislava and Budapest, and for much of the way between the last two it forms the border between Slovakia and Hungary, so your phone may switch between their networks. This matters only on a country plan: choose that country's network manually.
On the day boats from Budapest to the Danube Bend, the signal holds along most of the route.
Which plan fits your trip
With an EU SIM, you may need nothing extra; if your data allowance abroad is small, a Europe plan covers the trip.
For everyone else, Telcomia's Europe plan covers Austria, Hungary, Czechia and Slovakia on one eSIM, plus most other EU countries, the UK and Switzerland if the trip continues. Each country also has its own plan, for example Czechia or Hungary, which suits a stay in that country only.
Open the plan details before you buy: they show the duration, the data, whether you can share the connection with other devices, and the Activation line, which tells you what starts the plan's validity.
Before you leave
- Check your home tariff: its data allowance in the EU or, with a UK SIM, whether EU countries are included.
- Read the Activation line in the plan details, then install the eSIM at home on Wi-Fi.
- Set the eSIM as your mobile data line, with data roaming on for the eSIM and off for your home line.
- Save train tickets and offline maps of the four cities before you board.
- On a country plan, choose that country's network manually near borders and on the Danube.
- Keep the eSIM installed until the trip is over: some eSIMs can be installed only once.
Consular protection: help in four capitals
- 112 reaches the emergency services in all four countries. The police answer on 133 in Austria, 107 in Hungary and 158 in Czechia and Slovakia.
- In the mountains, Austria's alpine number 140 is for Austrian lines, so dial 112 with a foreign SIM; mountain rescue is 1210 in Czechia and 18 300 in Slovakia.
- Embassies are in Vienna, Budapest, Prague and Bratislava. The Telcomia app shows which mission is responsible for you, with address and phone.
- Emergency phrases in German, Hungarian, Czech and Slovak are ready to show on screen in the app.
Questions travellers ask about the Vienna, Budapest, Prague and Bratislava loop
Does EU roaming cover Vienna, Budapest, Prague and Bratislava?
Yes, for SIMs from EU countries: all four countries are in Roam Like at Home. Check how much data your tariff includes abroad.
I'm from the UK or the US: what do I need?
Check whether your UK tariff includes EU countries; a US SIM usually pays roaming. Either way, one Europe plan on an eSIM covers all four countries.
One Europe plan or four country plans?
For the whole loop, one Europe plan: a single installation and nothing to change at the borders. A country plan suits a stay in one country.
Does the eSIM work on the train between the cities?
Yes, wherever the line has coverage: the phone moves to the next country's networks at the border, and the Europe plan covers all four. A single-country plan stops at the border.
The short version
With an EU SIM, your tariff already works in all four capitals. From anywhere else, install one Europe plan before you travel, save your train tickets offline and keep 112 in mind.
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