Options & Services WiFi-Calling

WiFi-Calling: calling over Wi-Fi.

With WiFi calling, you can make calls on any WiFi in the world, whether in your home, hotel or office. You simply use the included services of your subscription as if you were in Switzerland. No roaming fees and no app. We recommend using WiFi calling especially when the mobile network coverage is not optimal, for example indoors.

All you need is a mobile phone that supports this function and you have to activate WiFi Calling one time on the device. To ensure that the phone does not connect to the mobile network, we recommend turning on flight mode first and then activating WiFi.

*Exception: If your subscription includes roaming calls but no international calls (from Switzerland to abroad), and you make a Wi-Fi Calling (VoWiFi) call from abroad, it will be charged as an international call. In this case, it is recommended to make your call via the mobile network. 

No additional costs

The function WiFi calling is completely free and also works with PrePay contracts.

No roaming fees*

For incoming and outgoing calls and SMS, you use the included services of your subscription as if you were phoning in Switzerland.


Your smartphone searches automatically for the best WiFi network for your calls.

Quite simple without an app

Neither you nor the person you are calling needs to install an app. WiFi calling works with all mobile and landline numbers worldwide.

No data usage

You don't use any data volume as you are connected via WiFi.


Salt guarantees the proper functioning of WiFi Calling on smartphones purchased directly from Salt, i.e. in Salt Stores, in the Salt online store or via our customer care. WiFi Calling is generally not supported on prepaid smartphones of certain manufacturers, regardless of the sales channel. You can find a list of all WiFi Calling compatible devices here.