Patent ID: 7369848

Claim:
A method for mobile communication in multiple mobile communications networks, the method comprising: a Foreign Public Mobile Network (FPMN) allocating at least one local Mobile Subscriber Identity (IMSI) to a Home Public Mobile Network (HPMN) for the use of subscribers of a multiple IMSI multiple Mobile Subscriber Integrated Services Digital Network number (MSISDN) service (MIMM) of the HPMN when roaming outside of the HPMN, wherein the FPMN is a partner network of the HPMN, and wherein the FPMN allocates a designated range of local IMSIs to the HPMN for the HPMN to provision to its MIMM subscribers; and when a MIMM subscriber roams outside of the HPMN, the HPMN performing registration of one of the FPMN local IMSIs at the HPMN, such that a MIMM subscriber device appears as a roaming device in the FPMN, even though the FPMN local IMSI is used; and the HPMN performing authentication of the FPMN local IMSI at the HPMN using a HPMN Ki, such that the MIMM subscriber device appears as a roaming device in the FPMN, even though the FPMN local IMSI is used.