METHOD AND APPARATUS FOR SYNCHRONIZING A DATABASE IN PORTABLE COMMUNICATION DEVICES

摘要

A method for tracking changes to a database stored in a SIM card of a mobile station, the method comprising the steps of: providing, in a memory of said mobile station and on said SIM card, a checksum storage area for checksums associated with said database; making a change to said database; comparing checksums stored in said memory and on said SIM card; calculating, after said change, a modified checksum based on said database; and storing said modified checksum in said memory and on said SIM card.