In Basel, three countries meet. Weil am Rhein in Germany and Saint-Louis in France border the city, trams run across both borders, and EuroAirport Basel-Mulhouse-Freiburg lies on French territory. Germany and France are in the EU's Roam Like at Home area and Switzerland is not, so a phone can move in and out of EU roaming without you noticing.
This guide explains roaming between Switzerland, Germany and France in the Basel tri-border area: who pays what, why a phone switches to another country's network, what EuroAirport means and one plan for all three.
Key facts for the Basel tri-border
- EU roaming: Germany and France are covered by Roam Like at Home; Switzerland is not
- Border trap: in and around Basel, a phone can connect to a Swiss, German or French network
- EuroAirport: on French territory, serving both Switzerland and France
- One plan for all three: the Europe plan covers Switzerland, Germany and France; a Switzerland plan works only in Switzerland
- Emergency numbers: 112 in all three; police 117 in Switzerland, 110 in Germany and 17 in France
- Embassies: mostly in Bern, Berlin and Paris
The Basel tri-border: three countries, two roaming rules
On an EU SIM, German and French networks are billed as at home, and a Swiss one as roaming outside the EU: some operators include Switzerland, many charge for it. Visitors with a SIM from outside the Roam Like at Home area usually pay roaming in all three countries unless their tariff includes them.
A Telcomia Switzerland plan works only in Switzerland, so a German or French network gives it no data, while on the Europe plan a switch between the three countries' networks stays within the plan.
Why your phone switches to a German or French network
Near a border, a phone can connect to the strongest signal, even one from the next country. In Basel it can pick up a German or French network, and on the German or French side a Swiss one.
EuroAirport is a special case: it lies on French soil, so a phone landing there can pick up a French network before it sees a Swiss one. That is fine on an EU SIM or the Europe plan, but a Switzerland plan has no data until the phone is on a Swiss network.
Near the border, set network selection to manual in your phone's mobile settings, pick a network of the country you are in and check its name before you use data.
Which plan fits your trip
For Basel, the Telcomia Europe plan is the simplest choice: it covers Switzerland, Germany and France on one eSIM, among 38 destinations, so the airport, the city and trips across the border stay within one plan. A Switzerland plan suits a trip that stays inside Switzerland.
With an EU SIM you are already covered on German and French networks, so the gap is Switzerland. Standard plans are data only, 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 you may share the connection.
Before you leave
- Install the eSIM at home on Wi-Fi and set it as your line for mobile data.
- Turn data roaming on for the eSIM and off for your home line.
- Find manual network selection in your phone's settings.
- Check whether your home tariff includes Switzerland.
- Save 112 and the police number of each country.
Consular protection: three countries, three police numbers
- 112 works in all three countries; in Germany it reaches the fire service and ambulances, and 110 is the police.
- In Switzerland, 117 is the police, 118 the fire service and 144 an ambulance.
- In France, 15 is for medical emergencies, 17 the police and 18 the fire service.
- Embassies are mostly in Bern, Berlin and Paris, and many countries have consulates in Zurich and other large cities. 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 Switzerland, 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 in German and French ready to show on screen.
Switzerland travel-safety page →
Questions travellers ask about the Basel tri-border
Does EU roaming work in Basel?
Not by law. Basel is in Switzerland, outside Roam Like at Home, so it depends on your operator: some include Switzerland, many charge roaming. On a German or French network, an EU SIM is billed as at home.
Is EuroAirport in Switzerland or France?
EuroAirport Basel-Mulhouse-Freiburg lies on French territory and serves both Switzerland and France. On landing, check which network your phone has joined before you use data.
Why did my phone switch to a German network?
Weil am Rhein, in Germany, borders the city, and a phone can join the strongest signal, even across a border. On an EU SIM, this is billed as at home; on a Switzerland plan it means no data, so choose a Swiss network manually.
One plan for Basel, Germany and France?
Yes: the Europe plan covers Switzerland, Germany and France on one eSIM, among 38 destinations. A Switzerland plan works only in Switzerland.
The short version
Basel is in Switzerland, outside EU roaming, while neighbouring Germany and France are inside it, and a phone can switch between the three countries' networks. Check the network name, remember that a Switzerland plan works only in Switzerland, and use the Europe plan to cover all three on one eSIM.
Related reads:
When should I activate my Switzerland eSIM?
Each plan shows before you pay when it starts counting. Plans that start on connection start counting the first time they connect to a network in one of the countries they cover: install the eSIM before you leave, keep the line off until you arrive in Switzerland, and you'll have data as soon as you land. Some also work in other countries (each plan lists which): if the line connects earlier, at home or on a layover, it starts counting there. Plans that start when you buy them are best bought on the day you'll start using them.
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