Abstract: A method is disclosed for computing the local time and date of a mobile computer, when a user has traveled to a time zone different from his or her home time zone is disclosed. A system identification number is received through a cellular transceiver which is associated with an antenna. The system identification number is received by the mobile computer through a cellular modem. A database is provided within the mobile computer listing all of the system identification numbers throughout the North American Cellular Network. The database also provides the geographic location and time zone for each system identification number. Also listed in the database is information whether daylight savings time is observed in the geographic location associated with the system identification number. The computer, upon receiving a system identification number, searches the database for the same identification number.

Abstract: A method of associating features, such as phone number directories, of a mobile communication module with individual NAMs in a communication module having a plurality of NAMs so as to provide accessibility to the directories based on the NAM activated for convenient and efficient access including the steps of establishing and comparing identification codes and further providing the option of changing phone number directories when changing NAMs or receiving the same NAM.