1. A method, comprising: receiving, by a network device comprising a processor, registration request data related to a registration request from a mobile device; sending, by the network device, the registration request data to a home network device; in response to the sending the registration request data to the home network device, receiving, by the network device, registration rejection data associated with a rejection of the registration request from the home network device; and in response to the receiving the registration rejection data from the home network device, sending, by the network device, the registration rejection data to the mobile device.