Method for temporarily personalising a mobile communication device in a communication network in order to allow an identified and authenticated user access to services of a communication network, comprising the steps of: - establishing a communication connection between the mobile communication device and an authentication device, the mobile communication device being communicatively connected to a communication network; - transmitting an authentication request from the authentication device to the mobile communication device; - detecting a unique user feature selected from the group comprising a biometric user feature, alphanumeric identifier or personal behaviour pattern, by means of a detection means of the mobile communication device; - transmitting the detected unique user feature to the authentication device; - comparing the transmitted unique user feature with a reference feature from a plurality of reference features of various users, which reference feature is stored in the authentication device; transmitting a user identifier to the mobile communication device in the event of a match between the transmitted unique user feature and the stored reference feature, the mobile communication device being registered in a communication network by means of the user identifier by, after identifying and authenticating the user together with the user identifier, storing a subscriber identifier in the mobile communication device, via which subscriber identifier access to services of a communication network is made possible, characterised in that a hierarchical reference model of unique features is also stored in the user identifier, which model determines which unique user features are to be detected for which services in order to personalise the communication device and be able to use the service, it being stored in the hierarchical reference model that, in the event of a poor match, a user feature that is hierarchically higher with respect to security is detected in order to compensate for the poor match. - establishing a communication connection between the mobile communication device and an authentication device, the mobile communication device being communicatively connected to a communication network; - transmitting an authentication request from the authentication device to the mobile communication device; - detecting a unique user feature selected from the group comprising a biometric user feature, alphanumeric identifier or personal behaviour pattern, by means of a detection means of the mobile communication device; - transmitting the detected unique user feature to the authentication device; - comparing the transmitted unique user feature with a reference feature from a plurality of reference features of various users, which reference feature is stored in the authentication device; transmitting a user identifier to the mobile communication device in the event of a match between the transmitted unique user feature and the stored reference feature, the mobile communication device being registered in a communication network by means of the user identifier by, after identifying and authenticating the user together with the user identifier, storing a subscriber identifier in the mobile communication device, via which subscriber identifier access to services of a communication network is made possible, characterised in that a hierarchical reference model of unique features is also stored in the user identifier, which model determines which unique user features are to be detected for which services in order to personalise the communication device and be able to use the service, it being stored in the hierarchical reference model that, in the event of a poor match, a user feature that is hierarchically higher with respect to security is detected in order to compensate for the poor match.