Activating Callfilter and blocking numbers

Incoming calls are blocked automatically in the following cases:

• Caller does not comply with transparency requirements and conceals details such as purpose of call, company name, telephone number, etc. 
• Caller disregards the asterisk entry in the telephone book. 
• Caller calls at inconvenient times: before 8 am or after 8:30 pm on weekdays and before 9 am or after 4 pm on weekends and public holidays.
• Callers make repeated calls in the course of a single day. 
• Aggressive advertising calls (e.g. spurious sales pitches) 
• Calls from numbers with an invalid numerical format.  
• Numbers that are frequently blocked independently by Swisscom customers.

Calls from numbers that are independently blocked by numerous customers will not be blocked in the following cases:

• Caller complies with the code of conduct of the call centre association (Callnet.ch) and respects asterisk entries, for example, and does not make calls at unreasonable times, etc.. 
• Calls from reputable survey institutes, which comply with their industry regulations and which are not advertising calls.  
• Calls from public authorities, such as the Swiss Federal Statistical Office. 
• Calls from companies contacting their own customers using numbers that differ from those used for advertising calls.

Security measures recommended by Swisscom(opens in new tab)

Notification form for residential customers