Two popular low-cost providers on the Swisscom network: Wingo, the online arm of Swisscom, and Migros Mobile with in-store support and Cumulus points. Same network, different service model.
Both offer the same Swisscom network at a discount price. Wingo is purely online, with a free eSIM and often the lower entry price. Migros Mobile offers support in the store, fixed permanent prices and Cumulus points. If you are comfortable online you will usually take Wingo, if you value personal advice or the Migros ecosystem you will pick Migros Mobile. The concrete prices are above, updated daily.