Patent ID: 8331927

Claim:
A method of supporting a call service at a mobile communication terminal including a plurality of subscriber information modules for a respective plurality of service providers, the method comprising: receiving from a base station information including a network identification number of at least one other mobile communication terminal for performing communication with the at least one other mobile communication terminal; determining a service provider corresponding to the network identification number; storing in a database at least one of a phone number of the at least one other mobile communication terminal and an index corresponding to the phone number, and at least one subscriber information module information issued by the service provider of said at least one other mobile communication terminal; and outputting a popup window for selecting a subscriber information module and discount service information onto a display unit, wherein outputting the popup window comprises recommending a particular subscriber information module from among the plurality of subscriber information modules in order to receive discount services when communicating with said at least one other mobile communication terminal.