For reverse-charge calls, the call recipient has to pay for the call charges. You can protect yourself from having to pay for calls made by other people by rejecting reverse-charge calls.
As soon as the block is active, the caller will hear this message: “The requested connection is not possible.”
Blocking reverse-charge calls from being accepted
Reverse-charge calls cannot be blocked in certain countries. Responsibility for this lies with the foreign telephone companies. Swisscom assumes no liability for call charges incurred.
This service is not available for the new landline telephone system.