This study examined how mobile phones work, the design of the graphical user interface, the design of the application and the design of the database used for the K-Backup system. This application backs up mobile phone and Subscribers Identification Module (SIM) data (contacts and SMS) on the computer storage. It also allows for easy retrieval and restoration of the data to phone memory when the need arises. The objectives considered in the design included: user-friendly graphical user interface (GUI) for user interaction; modular subroutines, methods and functions that retrieves data from the phone and stores it on the computer memory; modular subroutines, methods and functions that retrieves data from the SIM and stores it on the computer memory; modular subroutines and functions that send data from the computer back to the phone; portable database for storing and retrieving the data. Keywords: Mobile Phone, Data Backup, System Design, GSM, Phone Data
