A Swiss mobile number is required kit for bank apps, insurance SMS, and landlord contact in Zurich, Geneva, Basel, Bern, or Lausanne. Swiss telecom rules require every SIM to be registered to a named person with identity documents.
What works on arrival?
Visit Swisscom, Sunrise, or Salt shops at Zurich Airport, Geneva Airport, or Basel EuroAirport, or city-centre stores on Bahnhofstrasse, Rue du Rhône, or near Bern Hauptbahnhof. You can also buy prepaid packs at Migros, Coop, Interdiscount, and MediaMarkt. Bring the physical passport (or Swiss ID / residence permit if you already hold one). Staff handle registration at brand stores; supermarket kiosks often leave activation to you via app or hotline, which is slower if German, French, or Italian menus confuse you depending on the canton.
Swisscom usually leads alpine and rural coverage (Valais valleys, Graubünden, Ticino mountain roads); Sunrise is strong in cities; Salt competes on price in urban cores. MVNOs such as Wingo, Yallo, and Lidl Connect ride those networks at lower prices once you can complete registration. Travel eSIMs help on the SBB train from the airport, but they do not replace a Swiss MSISDN for bank two-factor flows or many Krankenkasse portals.
Ask the clerk to confirm the number is a Swiss 07x mobile and that registration finished before you leave. Keep the SIM sleeve and any activation SMS; Swiss shops sometimes ask for the original pack when you later port the number.
When should you switch to an Abo?
Monthly Abos (subscriptions) usually want a Swiss billing address after Anmeldung / registration at the Einwohnerkontrolle / contrôle des habitants, plus local bank details for direct debit (LSV or e-bill). Start prepaid, then port the number into Swisscom, Sunrise, Salt, or a cheaper MVNO once the permit and flat are stable: Apply for a residence permit. Bundle fibre later under utilities, internet and transport, especially in older Geneva or Zurich Altbau buildings where copper still appears in some stairwells.
If you move from Zurich to Lausanne or Basel, keep the same Swiss number through portability. Coverage gaps matter more when you ski or work in alpine communes than when you stay inside the city ring.
Common misconceptions
Assuming you can skip ID at a Migros till fails. Swiss law still ties the line to a passport or national ID.
Assuming roaming from an EU SIM is enough for Swiss banking apps also fails. Many Swiss services expect a local 07x number, and Swiss roaming prices from EU packs can still surprise you.
Assuming Salt alpine coverage matches Swisscom everywhere also fails. Check maps if your flat or workplace sits in a mountain valley.
Summary
Register prepaid with passport ID on day one, keep the Swiss number for banks and landlords, and move to an Abo only after address registration and local banking exist. Coverage choices matter more in the Alps than in the city centres.
Sources
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