원래 이름 기록: British Telecommunications Public Limited Company

A method () of operating a cellular telecommunications system (), said system comprising User Equipment (), UE, and a cellular private network (-), and the method comprising the steps of: storing, at the UE and at the private network, a: Static IDentifier, SID; and first Network IDentifier, NID, for uniquely identifying the private network to the UE, wherein the first NID comprises the SID; by the private network: broadcasting the first NID; modifying the first NID into a second, different, NID for uniquely identifying the private network (), wherein the second NID is unfamiliar to the UE for the purposes of permitting the UE to request a connection to the private network on the basis of the second NID, and in which the second NID comprises: the SID, wherein the SID remains unchanged as between the first and second NIDs; and a Variable IDentifier, VID, consisting of at least one character that is different to a corresponding portion of the first NID; and subsequently broadcasting the second NID instead of the first NID, thereby instead to identify the private network using the second NID; by the UE: detecting the broadcast second NID (); determining, using the SID, that the detected second NID comprises the SID (-); and requesting, in response to determining that the broadcast second NID comprises the SID, attachment to the private network using the SID, despite the second NID being unfamiliar to the UE (-).