SUBSCRIPTION IDENTIFIER FOR A COMMUNICATION NETWORK

A communication device (2) obtains a subscription identifier (50) that identifies a subscription to a first communication network (10). The subscription identifier (50) includes a first network identifier (52) that identifies the first communication network (10) and includes a second network identifier (54) that identifies a second communication network serving the first communication network (10). In some embodiments, the subscription identifier (50) conceals the first network identifier (52). Alternatively or additionally, the subscription identifier (50) is an International Mobile Subscriber Identity, IMSI, or is a Network Access Identifier, NAI, that includes the first network identifier (52) in a username part of the NAI. Regardless, the communication device (2) transmits the subscription identifier (50).