You can activate and also deactivate call barring free of charge directly in "Settings" for each of your individual rates.
Two call barring sets are available:
Call barring set 0906x
This block set blocks calls to adult entertainment lines. You can continue to access helplines or transportation schedules on 0900 or 0901 numbers.
Call barring set 090x
With this call barring set, all calls to 090x numbers are generally blocked. Calls to SBB timetable information, televoting and general entertainment, such as horoscopes, chat forums, games, competitions, surveys, etc. are now no longer possible.
By the way, in the yallo app you always have an overview of your call barring settings when you are on the go.