Swapping short-haul flights for trains is one of the easiest ways to make a European trip lighter on the planet. It is also slower, more scenic and, honestly, a lot more fun.
But there is one practical question that catches almost everyone on a multi-country rail trip: how do you keep your phone working when you are in Paris on Monday, Basel on Wednesday and Ljubljana by the weekend?
Here’s how I’d approach it, without paying a fortune or spending half the trip hunting for SIM shops.
Why connectivity matters more on a train trip
When you fly, you land, find the hotel and switch on the Wi-Fi. Rail travel is different. You are often booking the next leg on the go, checking platform changes, showing digital tickets to the conductor and looking up how to get from the station to your guesthouse.
Most rail operators now push you towards their apps for tickets and live updates, and many regional trains have patchy on-board Wi-Fi or none at all. So your own mobile data does a lot of heavy lifting on a slow travel trip.
Your three main options
1. Roaming on your home plan
If you live in the EU, you are in luck: under the EU’s “roam like at home” rules you can use your normal allowance in other EU and EEA countries without extra charges, within fair use limits. Do check Switzerland, which is not covered, and the UK, where it depends on your provider.
If you are travelling from outside Europe (or from the UK on a plan without free EU roaming), daily roaming passes can quickly cost more than your train tickets.
2. Buying a local SIM in each country
This used to be the budget traveller’s go-to, and it still works if you are staying a long time in one place. On a rail trip through four or five countries, though, it means:
- Finding a shop in each new city (often closed on Sundays)
- Showing your passport to register the card in many countries
- Swapping tiny plastic cards on a moving train
- A pile of single-use packaging and SIMs you’ll never use again
Not exactly the low-waste, low-stress trip we were going for.
3. One regional eSIM for the whole trip
This is what I would recommend for most multi-country itineraries. An eSIM is a digital SIM that you download straight to your phone, so there is no plastic and nothing to post. A regional plan covers a group of countries on a single eSIM, so your data simply keeps working as the train crosses the border.
A few things to look for before you buy:
- Country list. Make sure every country on your route is included. Non-EU countries such as Switzerland, the UK or parts of the Balkans are worth double-checking.
- Validity. Match the plan length to your trip, usually 15 or 30 days for a slow travel route.
- Hotspotting. Handy if you want to work from a laptop on the train or share data with a travel buddy.
- Top-ups. Slow trips have a habit of getting longer. Being able to add data from an app beats starting from scratch.
Most travel eSIMs are data only, which is fine for maps, tickets and WhatsApp calls. If you need a local number for calls, a regional eSIM won’t give you one. For everyone else, a data-only eSIM for Europe that covers every country on your route on one plan is the simplest way to avoid juggling SIM cards at every border.
How to set it up (before you leave)
The golden rule: install your eSIM at home, on Wi-Fi, a day or two before you travel. Then:
- Check your phone is unlocked and eSIM-compatible (most recent iPhones, Pixels and Samsung Galaxy phones are).
- Install the eSIM using the QR code or the provider’s app.
- Label it something clear like “Europe data” in your settings.
- Keep your home SIM on for calls and texts, but switch its data roaming off.
- Turn on data roaming for the eSIM line when you arrive.
That last point confuses a lot of people: eSIM providers use partner networks, so your phone needs roaming switched on for the eSIM to connect.
A few slow travel tech tips
- Download offline maps for every city on your route. Alpine tunnels and rural stretches still drop signal.
- Save tickets as PDFs or screenshots, not just in the app.
- Bring a power bank. Not every train has working sockets, and navigation drains your battery fast.
- Keep your home number active so bank verification texts still reach you.
Is an eSIM always the right choice?
Not always. If you are an EU resident travelling only within the EU, your normal plan may already cover you for free. If you are staying in one country for several months, a local SIM is usually cheaper. And if your phone is locked to your carrier, an eSIM simply won’t work.
But for a classic slow travel route across several countries, one eSIM that keeps working from station to station is hard to beat. It means less time in phone shops, less plastic, and more time looking out of the window.
Have you done a rail trip across Europe? Let me know in the comments how you stayed connected!
