Swisscom
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Swisscom runs the country's biggest network infrastructure and dominates the Swiss telecom market. They offer high-speed fibre-optic internet bundled with TV and mobile plans, and they maintain a dedicated expat service page to walk newcomers through the connection process in English.
Whether you want a single internet plan or a combined bundle with TV and mobile, Swisscom's nationwide coverage and established customer service make it the default choice for most relocating households. Check their expat resources to get connected quickly.