US Patent 8442527 Cellular authentication for authentication to a service

An identification system comprises a communication interface. The communication interface is configured to receive from a mobile device a registration request to initiate an access session between the mobile device and a communication network, wherein the registration request comprises a device identifier that identifies the mobile device. In response to the registration request, the communication interface is configured to transfer a packet address to the mobile device, wherein the mobile device transfers a service request for a service on the communication network during the access session, wherein the service request includes the packet address. The communication interface is configured to receive an identification request transferred from an authentication system in response to the service request, wherein the identification request indicates the packet address. In response to the identification request, the communication interface is configured to transfer the device identifier for delivery to the authentication system to authenticate the mobile device for the service using the device identifier.