A method and system is disclosed for populating a local second line service (“SLS”) database in a telecommunications device (“TD”). The local SLS database is for use by an SLS application that provides a second line service to the user of the TD. To populate the local SLS database, historical data associated with prior use of the TD is mined for relevant information. Relevant information may include, for example, a primary phone number associated with other contact data. Relevant information is then used to populate the local SLS database. The local SLS database is then updated with a relationship number(s) in association with the relevant information. The relationship number enables the SLS application to direct a telecommunication to the primary number via a remote SLS platform.