A system for allowing a GSM subscriber to use a SIM card in a CDMA service
area. A CDMA terminal having a mountable SIM card, includes a SIM
interface for interfacing between the SIM card and a controller of the
CDMA terminal. The CDMA terminal reads unique subscriber information for
SIM card verification from the SIM card and sends the read unique
subscriber information, when the SIM card is mounted therein, and enables
the SIM card upon receipt of verification for the SIM card. A CDMA
subsystem sends a verification confirm request for the SIM card to a GSM
subsystem using the unique subscriber information and information about a
predetermined agreement with a GSM system upon receipt of the unique
subscriber information for SIM card verification; and assigns a unique
virtual management number for the CDMA terminal mounted with the SIM card
and sends SIM card verification to the CDMA terminal when the GSM
subsystem verifies the SIM card. The GSM subsystem verifies the SIM card
in response to the verification confirm request for the SIM card and sends
the verification result to the CDMA subsystem. A public network connects
the CDMA subsystem and the GSM subsystem.
