Abstract: Methods and systems are disclosed for routing a communication to a recipient mobile device. The communication is received at a switching center. The recipient mobile device is identified from the communication. Which of multiple identifiers of the recipient mobile device is active is identified. Each of the identifiers is uniquely assigned to the recipient mobile device, and each of the identifiers is associated with a mobile communications network. The active identifier was previously activated by one of the mobile communications networks that services a geographical area in which the recipient mobile device is physically present. That mobile communications network is identified from the active identifier. The communication is accordingly routed to the mobile communications network with instructions to further route the communication to the recipient mobile device.