Provision of additional network addressable numbers on single mobile device

A method for enabling a cellular mobile communications device that has a carrier assigned primary number to include one or more additional network accessible numbers such that calls to the one or more additional network numbers will terminate at the cellular mobile communications device and, the cellular mobile communications device can originate calls from the one or more additional network accessible numbers all within the same cellular mobile communications device, the method comprising:

• assigning an additional network accessible number to a first cellular mobile communications device, wherein the first cellular mobile communications device includes a second line calling application;
• selecting a first relationship number that is unique for the additional network accessible number and a third party calling number pair, wherein the first relationship number is a network recognizable number;
• forwarding the selected relationship number and the third party calling number to the first mobile communications device;
• receiving a call initiation into the telephone network from a second cellular mobile communications device, wherein the call initiation identifies the additional network accessible number of the first cellular mobile communications device as the dialed number;
• the telephone network identifying the additional network accessible number as a valid network accessible number that is serviced by a specialized platform;
• the telephone network routing the call initiation to the specialized platform;
• the specialized platform identifying that the first relationship number is associated with the additional network accessible number and the calling line identifier of the second mobile communications device, which is the third party calling number;
• the specialized platform completing the call initiation by establishing a call request to the primary number of the first mobile communications device with the first relationship number utilized as the calling line identifier, wherein the first mobile communications device can lookup the first relationship number to identify the call as being directed to the additional network accessible number and originating from the second mobile communications device.