The invention relates to a method for anonymization of event data collected within a system or network providing a service for subscribers/customers wherein each event data set is related to an individual subscriber/customer of the system/network and includes at least one attribute wherein the method counts the number of event data sets related to varying individual subscribers having identical or nearly identical values for at least one attribute. The invention further relates to a method for anonymization of static data related to individual subscribers of a mobile communication network wherein each static data set consist of different attributes and the method identifies specific profiles derivable form the static data and drops one or more respective attribute of the static data sets and/or classifies two or more static data sets to a certain group having at least one matching attribute.