In order to support the access of a terminal to a mobile communication network, a network subscriber identifier and a plurality of authentication data sets relating to this network user identifier are transferred to the terminal by an access support server. The plurality of authentication data sets are generated previously by a server of the mobile communication network, after the access support server has transmitted the network subscriber identifier to the server. In order to check an authentication information item of the terminal upon logging into the mobile communication network, an authentication server of the mobile communication network transmits an authentication data set from the plurality of authentication data sets, for example via the server.