Wi-Fi Calling improves reception via WLAN, also known as WLAN calls or VoWiFi. Calls and SMS are charged according to your tariff. It is only available in Switzerland (no roaming).
Who can use Wi-Fi Calling?
You need a smartphone and operating system supporting Wi-Fi Calling
There has to be a Wi-Fi connection and good internet connection
Mobile plan and prepaid users can use Wi-Fi Calling
Better Reception in Enclosed Spaces
No Additional Apps Needed to Call or Send SMS
No Additional Basic Fees
Conditions & Fact Sheet
FAQ
How can I tell if I am currently using Wi-Fi Calling?