A communication system for communicating via a communication network comprising a subnetwork operated by a mobile radio network operator MNO, the communication system comprising: - a communication device, wherein the communication device comprises a subscriber identity element for authenticating the communication device to the communication network, wherein the subscriber identity element is assigned a subscriber identity identifier, and the subscriber identity element comprises: a) a memory in which a bootstrap profile of the subscriber identity element is stored as an initialization profile, wherein the initialization profile indicates a subnetwork identifier of the subnetwork and a discovery server identifier for a discovery server; and b) a communication interface configured to establish a communication link to the discovery server with the use of the subnetwork identifier and to send the subscriber identity identifier via the communication link to the discovery server; and - the discovery server for communicating with the subscriber identity element via the communication network, wherein the discovery server is assigned to the subnetwork of the communication network, said subnetwork being configured as a discovery slice, and is arranged in and addressable via the discovery slice, the discovery server comprising: A) a processor configured to determine a profile server identifier of a profile server based on the subscriber identity identifier, wherein the profile server is assigned to the subscriber identity element and the MNO; and B) a communication interface configured to receive the subscriber identity identifier via the communication link from the subscriber identity element, wherein the communication interface is further configured to send the profile server identifier via the communication link to the subscriber identity element; - a database, wherein the database is assigned to the subnetwork, wherein the database indicates an assignment of a plurality of subscriber identity identifiers to a plurality of profile server identifiers, and wherein each subscriber identity identifier is assigned a profile server identifier, and wherein the database manages subscriber profiles, wherein communication between the subscriber identity element and the discovery server takes place via a base station of the communication network, and the discovery server and the database are arranged in a decentralized manner. - a communication device, wherein the communication device comprises a subscriber identity element for authenticating the communication device to the communication network, wherein the subscriber identity element is assigned a subscriber identity identifier, and the subscriber identity element comprises: a) a memory in which a bootstrap profile of the subscriber identity element is stored as an initialization profile, wherein the initialization profile indicates a subnetwork identifier of the subnetwork and a discovery server identifier for a discovery server; and b) a communication interface configured to establish a communication link to the discovery server with the use of the subnetwork identifier and to send the subscriber identity identifier via the communication link to the discovery server; and a) a memory in which a bootstrap profile of the subscriber identity element is stored as an initialization profile, wherein the initialization profile indicates a subnetwork identifier of the subnetwork and a discovery server identifier for a discovery server; and b) a communication interface configured to establish a communication link to the discovery server with the use of the subnetwork identifier and to send the subscriber identity identifier via the communication link to the discovery server; - the discovery server for communicating with the subscriber identity element via the communication network, wherein the discovery server is assigned to the subnetwork of the communication network, said subnetwork being configured as a discovery slice, and is arranged in and addressable via the discovery slice, the discovery server comprising: A) a processor configured to determine a profile server identifier of a profile server based on the subscriber identity identifier, wherein the profile server is assigned to the subscriber identity element and the MNO; and B) a communication interface configured to receive the subscriber identity identifier via the communication link from the subscriber identity element, wherein the communication interface is further configured to send the profile server identifier via the communication link to the subscriber identity element; A) a processor configured to determine a profile server identifier of a profile server based on the subscriber identity identifier, wherein the profile server is assigned to the subscriber identity element and the MNO; and B) a communication interface configured to receive the subscriber identity identifier via the communication link from the subscriber identity element, wherein the communication interface is further configured to send the profile server identifier via the communication link to the subscriber identity element; - a database, wherein the database is assigned to the subnetwork, wherein the database indicates an assignment of a plurality of subscriber identity identifiers to a plurality of profile server identifiers, and wherein each subscriber identity identifier is assigned a profile server identifier, and wherein the database manages subscriber profiles,