Protect yourself from unsolicited calls
Put an end to nuisance calls from suspicious call centres: we show you how to block unsolicited calls to your mobile and fixed-network phone.
Nuisance calls from call centres or unknown numbers are a widespread issue. Ideally, you want to avoid the callers getting hold of your number in the first place. So, only enter your phone number into competitions, orders or registration forms if absolutely necessary. The free Callfilter call blocker also protects you from unsolicited calls.
How Callfilter works
The call filter blocks around 200,000 unsolicited calls every day and works similarly to an e-mail spam filter: it checks every calling phone number and separates the trustworthy from the suspicious. To do this, the call filter relies on a list of blocked numbers. The list contains the phone numbers of call centres that work with spurious sales pitches, call at inappropriate times or do not adhere to the callnet.ch code of ethics (e.g. by ignoring entries marked with an asterisk in the telephone directory). We are constantly developing the list in order to identify new kinds of unsolicited calls. If the call filter blocks the calling number, the call is not even displayed and the caller hears this voice message: “The intended call recipient does not wish to be disturbed.”
Activating Callfilter
The call filter for mobile phones can be activated in My Swisscom or in the Swisscom Cockpit under “Call settings”. Here, you can switch Callfilter on and off and view the last 20 blocked calls. The call filter for your fixed-network connection can be switched on or off in My Swisscom in one click.
Block anonymous calls
The call filter for fixed networks can already block anonymous calls and calls from unknown numbers. From 2025, this will also be possible with the call filter for mobiles. This protects you from harassment, such as stalking.
You can also block unknown numbers directly on your mobile (instructions for Apple and Android) or on WhatsApp for instance.
Further tips on number blocking
- Identify the numbers you want to block: Create your own blacklist in My Swisscom and store up to 200 numbers.
- Block calls from a specific canton or country: Enter the shared number combination and add an asterisk (e.g. England with the country code +44 12*).
- Add the last caller’s number to the individual blacklist: Enter the key combination *00# immediately after the call on your fixed-network phone. With a Swisscom HD phone, you can also use the crown key to block calls (video tutorial).
Useful links
- Fixed-network phone: blocking 0900 numbers and value-added services
- Mobile: blocking 0900 numbers and value-added services
- Trainer Marcel explains in this video
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