Romania was not the plan.
The original itinerary had Budapest as the eastern point of the trip.
Five days in Hungary, then back through Vienna. Straightforward, well-organised, easy to manage.
Then someone at the hostel in Budapest mentioned Brasov.
They described it the way people describe places they have genuinely loved — not with superlatives but with specific details.
The medieval walls still standing. The Black Church in the town square.
The Carpathian mountains visible from the old town streets.
The fact that most people travelling through Central Europe simply pass Romania on the way to somewhere they already planned to go.
I took a train east the following morning.
And discovered, somewhere between the Hungarian border and the Transylvanian plateau,
that my mobile data had stopped working.
What Happened at the Border
My data plan covered Hungary. I knew this. What I had not checked was whether the same arrangement extended to Romania.
It did not.
My home network classified Romania differently in its international roaming structure.
The data I had been using without thinking for four days in Budapest
simply stopped the moment the train crossed into Romanian territory.
Romania has excellent mobile infrastructure. The coverage was not the problem.
My plan was the problem.
I spent the journey to Brasov grateful I had downloaded offline maps before leaving the hostel,
and without the live navigation I had come to rely on for finding accommodation in unfamiliar cities.
Why European Connectivity Is More Complicated Than It Looks
Most travellers approaching a European trip assume the continent is a single connectivity environment.
The shared borders, the rail connections between cities, the sense of geographical continuity
— it all suggests a uniformity that the mobile industry has not fully kept pace with.
Mobile networks have their own roaming agreements with European carriers.
Some of these cover all European Union member states.
Others cover certain countries but not others, or at different rates,
or require specific add-ons that travellers may not have activated before departure.
Romania is an EU member state with reliable 4G and growing 5G coverage across its cities and tourist regions.
But the variation within European roaming coverage is real,
and discovering which specific arrangement applies to your plan at the border between countries is not the ideal moment.
The countries that most consistently fall outside standard international roaming arrangements are the non-EU ones:
Switzerland, Norway, Iceland, and Turkey.
These destinations appear regularly on European itineraries but sit outside the EU's regulatory framework.
Travellers who assume Europe means EU-and-beyond
often find unexpected gaps precisely at the borders they were not watching.
The Three Approaches — Honestly Assessed
Standard international roaming through your home network
For trips that stay within countries your home network covers at reasonable rates, this is often the simplest option.
The important step is verification before departure —
not the general marketing language about European roaming but the specific country list
and daily rate for each destination on your actual itinerary.
Romania, Bulgaria, Croatia, and the newer EU member states
are covered by most major international networks, but confirming the specific arrangement
for your plan and carrier is worth doing before you board rather than after you cross a border.
For short trips of four or five days with predictable routing, roaming can be entirely adequate.
For multi-country circuits covering four or more countries across two weeks,
the cumulative daily charges often exceed what a dedicated travel data plan would cost.
Local SIM cards per country
Available at Romanian airports and in cities.
Data rates through local Romanian carriers are among the most affordable in Europe —
one of the genuine advantages of travelling in Eastern Europe rather than Western Europe.
For an extended stay in Romania alone — a month exploring Transylvania,
the Danube Delta, the painted monasteries of Bukovina — a local Romanian SIM
is the most cost-effective option by a significant margin.
For multi-country itineraries crossing borders every week,
the practicality problem remains consistent: you swap your home SIM at each crossing,
your regular number goes dark, and you repeat the process at every subsequent border.
For a circuit combining Romania with Hungary, Bulgaria, and Serbia across three weeks,
the logistics of separate SIMs at each country transition become genuinely inconvenient.
Multi-country travel eSIM
This is what I use for any European trip that crosses more than two borders.An eSIM is a digital SIM built into your smartphone. You purchase a data plan before you travel, install it at home via a QR code or click-to-install link, and your phone connects to local networks in covered countries automatically. Your home SIM stays in your phone throughout — your regular number active for calls and texts. The eSIM handles data as a separate line.
The critical factor for European travel is the coverage list. After the Romania situation I looked specifically for plans that included the countries I was actually travelling through rather than the countries most providers defaulted to. The plan I settled on covers 36 European countries including Romania, Bulgaria, Hungary, Czech Republic, Croatia, nd every other EU member state — plus Switzerland, Norway, Iceland, Turkey, and the Canary Islands. The destinations that fall outside cheaper plans but appear regularly on real European itineraries.
I returned to Romania the following year with that plan installed before departure. Crossed from Hungary into Transylvania and my phone connected to Romanian networks automatically. No settings change required. No data gap on the train.
Why Romania Rewards Being Connected
Romania is a destination that genuinely benefits from having working navigation and live data throughout your visit.
Bucharest is a large, complex city where the contrast between its grand boulevards and its older neighbourhoods creates a geography that rewards exploration with a working map. The city's dining scene, its galleries, and the streets around the old town Lipscani district are considerably more enjoyable when navigation is functioning.
Transylvania is where connectivity matters most for independent travellers. The circuit between Brasov, Sighisoara, Biertan, and Viscri covers some of the most remarkable medieval architecture in Europe across routes that pass through villages with minimal signage. Live GPS navigation on these rural roads is the difference between finding a Saxon fortified church and spending an hour on an unmarked farm track.
The Danube Delta requires advance booking coordination with local boat operators and guides. Signal in the delta itself is intermittent — which is genuinely part of the experience — but having reliable data in Tulcea before departure to confirm bookings and download detailed maps of the waterways is practically essential.
The painted monasteries of Bukovina in the northeast require navigating between sites across a region where English signage is sparse. Translation apps, navigation, and the ability to research monastery opening times and seasonal access in real time makes the difference between a planned circuit and a frustrating series of closed doors.
For travellers combining Romania with neighbouring countries — the popular circuit through Hungary, Romania, and Bulgaria, or the route that extends through Serbia toward North Macedonia — a single data plan covering the entire circuit eliminates the connectivity gaps that border crossings create when plans are not properly verified in advance.
What the Plans Actually Cost
Current Europe eSIM plans covering Romania and 35 additional countries:| Plan | Validity | Price |
| 1 GB | 7 days | £3.49 |
| 3 GB | 30 days | £6.99 |
| 5 GB | 30 days | £8.99 |
| 10 GB | 30 days | £15.99 |
| 20 GB | 30 days | £23.99 |
| 50 GB | 30 days | £43.99 |
For a two-week Romania-focused trip combining Bucharest, Brasov, and the Transylvanian countryside
— navigation, messaging, restaurant research, photo uploads — the 5GB or 10GB plan covers most travellers comfortably.
For longer circuits combining Romania with multiple neighbouring countries across three or four weeks,
the 20GB plan provides comfortable headroom for heavier usage without the risk of running low mid-trip.
All plans include full hotspot support with no daily cap restrictions
— useful for sharing connectivity with travel companions
or connecting a laptop at accommodation where local WiFi is unreliable.
Setting Up Before Your Trip
Check eSIM compatibility: dial *#06# on your phone.
If an EID value appears, your device supports eSIM.
Most smartphones released since 2018 qualify, including iPhone models from XS onwards
and most Android flagship devices from 2019.
Confirm your phone is unlocked from your home carrier.
Device-locked phones cannot install travel eSIMs regardless of compatibility.
iPhone users can verify this under Settings → General → About → Network Provider Lock.
Android users may need to contact their carrier directly.
Purchase your plan and install at home on a reliable WiFi connection before departure.
Takes approximately five minutes.
Label the eSIM clearly in your phone settings so you can activate it quickly when you land.
On arrival in your first European destination: select the eSIM as your mobile data source,
enable data roaming, and your phone connects to local networks automatically.
Cross into Romania, Hungary, Bulgaria, or any other covered country
— the connection follows without any action required.
For a complete guide to choosing the right Europe eSIM for different trip lengths and travel styles,
the guide to using an eSIM in Europe covers coverage verification, plan selection, and setup in detail.
For current plan options and pricing across all 36 covered European countries, the
eSIM for travelling across Europe
page has everything clearly presented.
I spent four days in Brasov on that first unplanned visit. The medieval walls were exactly as described. The Black Church was extraordinary. The mountains visible from the town centre made the city feel genuinely unlike anywhere else I had been in Europe. I went back with working data installed before departure. The second visit was better in almost every practical way — better navigation through Transylvania's rural roads, easier coordination with local guides, more time in the places I had come to see rather than managing around connectivity gaps. Romania rewards travellers who arrive prepared. It is one of Europe's genuinely undervisited destinations, which means the experience of being there feels more authentic than many more famous European stops. Sort the connectivity before you board. Spend your time in Transylvania experiencing it.
