Patent ID: 7505769

Claim:
A mobile communications system, the system comprising: a plurality of Visited Public Mobile Networks (VPMNs), including at least one Foreign Public Mobile Network (FPMN); and a Home Public Mobile Network (HPMN) having a Home Location Register (HLR), the HPMN having at least one HPMN subscriber with an associated Subscriber Identity Module (SIM), the HPMN comprising a single signaling gateway for providing to each HPMN subscriber an International Mobile Subscriber Identity (IMSI) in the SIM and a corresponding Mobile Subscriber Integrated Services Digital Services Number (MSISDN) to operate in each of the at least one FPMNs, wherein the HPMN and each FPMN have a roaming agreement and an arrangement to support subscribers of Multiple IMSI Multiple MSISDN service (MIMM), wherein the single signaling gateway is configured to assign multiple IMSIs to a single MIMM SIM in a MIMM subscriber device, wherein the MIMM SIM is associated with multiple MSISDNs corresponding to the multiple IMSIs of the MIMM SIM, and wherein each IMSI of the multiple IMSIs is associated with a different network, including at least one FPMN.