Patent ID: 8385906

Claim:
A method of identifying new network affiliations of former subscribers that have left a first network operator, said method comprising: determining in-network calling behavior for a former subscriber of the first network operator, based on evaluating first call data records (CDRs) accumulated for a first data collection window occurring at least partly before the former subscriber left the first network operator; determining out-of-network calling behavior for one or more remaining subscribers that are identified from the in-network calling behavior of the former subscriber, based on evaluating second CDRs accumulated for a second data collection window occurring at least partly after the former subscriber left the first network operator; correlating the in-network calling behavior with the out-of-network calling behavior, to identify an external network subscriber that is involved in out-of-network calls with said one or more remaining subscribers that characteristically match prior in-network calls between said one or more remaining subscribers and the former subscriber; and identifying the new network affiliation of the former subscriber according to the external network number associated with the identified external network subscriber.