Callers who do not respect the requisite level of transparency (purpose of call, company name, phone number, etc. not displayed)
Callers who ignore the asterisk system in directories
Callers who call at inappropriate hours (before 8 am or after 8:30 pm on weekdays, before 9 am or after 4 pm on Saturdays, or on Sundays and public holidays).
Callers who call a customer more than once within a day
Numbers that many Swisscom customers have placed on their individual blacklists
Numbers that many customers have designated as unwanted
The Callfilter does not usually block the following numbers:
Calls that adhere to the code of conduct of the industry association for call centres (CallNet.ch), including respect for the asterisk system and no calls at inappropriate hours.
Calls from serious survey institutes which adhere to industry standards and are not advertising calls
Calls from official bodies such as the Federal Statistical Office
Calls from firms which contact their customers using different numbers than those used for advertising calls