Swisscom has been offering services based on mobility data of mobile customers for some time now. From a legal point of view, these services are not a problem as long as the mobility data is anonymized in the first step and then only processed in an anonymous state. For regulatory reasons, services are more problematic, in which mobility data is linked to other databases (e.g. CRM data). To solve these problems, Swisscom has developed an anonymization platform. The aim is to receive an external expert opinion, which examines the effectiveness of this anonymization platform and checks the effectiveness of the methods used. Specifically, it is a question of whether the data - anonymized via this platform – have sufficient low risk of re-identification of persons and thus fulfills the criteria for being called anonymized.