4.5 million calls blocked per month
Free of charge
More than 500,000 happy customers

An end to unsolicited advertising calls

Callfilter automatically blocks unwanted advertising calls. Callfilter is free of charge and can be activated for fixed and mobile lines.
Both residential and business customers can use Callfilter. For fixed networks, Callfilter is activated in the Customer Center; for mobiles, you can activate it in the Mobile Cockpit.

This is how the call filter works

The free Callfilter uses a continuously updated black list to block phone numbers. They come from dynamic lists of known spam callers. The list includes the phone numbers of call centres that use spurious sales pitches, call at inconvenient times (before 8 am or after 8 pm and at weekends) or do not comply with the Code of Conduct. The code includes respecting directory listings marked with an asterisk to stop nuisance calls and display of the caller’s own number.

The list also contains numbers blocked personally by fixed network Callfilter users. Customers block around 8,800 numbers daily. These numbers are not added to the black list immediately; they are anonymised and used to continuously improve call filter effectiveness. Callfilter also checks a number of criteria before the relevant number is placed on the general Callfilter list.