This European Telecommunication Standard (ETS) gives a description of the function associated with the administration of data related to subscribers, mobile equipments and services, specifically from the network management point of view. This data, known as the Subscriber Profile, is used for the provision of services for a particular user of a PLMN, or for the user s equipment represented by the International Mobile Subscriber Identity (IMSI) and the International Mobile Equipment Identity (IMEI) respectively. The functions include the administrative procedures for both the subscriber (for example provision of service ), and the equipment identified by the IMEI. Also included is the management of subscriber data necessary for network management. The managed functional entities involved are the Home Location Register (HLR), Visitor Location Register (VLR), Mobile Switching service Centre (MSC), Equipment Identity Register (EIR), Authentication Centre (AUC). The administration of subscriber data in all these entities is part of this ETS; which includes the means for a PLMN Operator to create, update, and delete information concerning a particular subscriber in order to allow (or bar) the use of the network.