You've booked the tickets, picked the accommodation, and yet one question still lingers as you close the suitcase: will your phone actually work once you cross the border? Good news straight away: for the vast majority of city trips in Europe, the answer is yes, without changing a thing about your usual plan.
But as soon as your itinerary steps outside the European Union, whether for a weekend in London, a trip to Zurich or a slightly further city break, the rules change completely. Here's how to know in two minutes whether you need to worry about your connection, and how to stay reachable and guided without a nasty bill when you get home.
Inside the European Union, your plan already follows you
Since 15 June 2017, the EU's “roam like at home” regulation has ended roaming charges within the European Union. In practice, your usual mobile plan works exactly as it does at home across the twenty seven EU countries, as well as in Iceland, Liechtenstein and Norway: calls, texts and data included, at the same price as back home. Paris, Rome, Lisbon, Vienna, Prague or Athens: for almost every city trip destination, there's nothing to prepare on the phone front.
The exceptions to know: the UK, Switzerland and beyond
Brexit changed things for the UK: EU law no longer applies there, and each carrier now sets its own rules. Some French plans still include London and the rest of the country in their free zone; others charge roaming like any other non EU destination. A quick check on your carrier's website before you leave avoids any surprise.
The same goes for Switzerland, which belongs to neither the EU nor the European Economic Area: in Geneva, Zurich or Lausanne, standard roaming charges apply, and they add up fast if you're not paying attention. The same principle holds for any destination outside the European circle, such as Turkey, Morocco or Egypt.
eSIM, the simplest solution for these destinations
For these few exceptions, the most practical solution remains a travel eSIM. It's an entirely digital SIM card, installed by scanning a simple QR code, no shop visit or fiddly tray needed. You buy and activate it before you even take off; it sits alongside your usual SIM thanks to the dual SIM feature on most recent smartphones, and it provides a local or regional data plan for the whole trip.
- Check your phone is compatible: most smartphones sold since 2019 support eSIM, a quick look in your device's settings confirms it in a minute.
- Pick a plan sized to your trip: for a weekend, a few gigabytes are plenty for maps, sharing your location and posting a few photos.
- Keep your usual SIM active to keep receiving calls and texts on your home number while the eSIM handles data.
- Activate the plan right before departure: most offers start the clock at first connection, not at purchase.
The other options, just as valid
An eSIM isn't compulsory. A local physical SIM card, bought in a shop or a newsstand on arrival, remains a simple and often very cheap option, as long as your phone is unlocked. A portable wifi hotspot, rented or brought along, lets you connect several devices at once, handy for a family or group city trip. And free wifi, now widely available in hotels, cafés and public transport across major European cities, covers most needs as soon as you set your bags down.
Staying connected without a second thought
A few simple habits, set up before you even close the suitcase, are enough to stop worrying about your connection once you're there:
- Download your destination's map for offline use (Google Maps or Maps.me) so you can find your way even without signal.
- Turn off automatic app updates while roaming: they can quietly eat up several hundred megabytes.
- Set a data usage alert in your phone's settings to keep a discreet eye on how much you're using.
- Use your accommodation's wifi for heavier tasks (backing up photos, video calls) and save mobile data for finding your way outside.
Once your connection is sorted, all that's left is to enjoy the trip. For the rest of the preparation, documents, cabin bag and bookings, our complete pre departure checklist covers all the essentials, and our guide on which bank card to use abroad pairs perfectly with these tips on the budget side.
And to build an itinerary that adapts to you, day by day, let the CityPlanner app take care of it.
