Patent ID: 7043238

Claim:
A code division multiple access (CDMA) terminal comprising: a cardholder for installing and uninstalling a user identity module (UIM) of a CDMA service subscriber; and a card interface for detecting whether a UIM card is installed in the cardholder, wherein when the card interface detects that the UIM card of the CDMA service subscriber is installed in the cardholder in the CDMA service area, the CDMA service subscriber can use the CDMA service, and the cardholder can install or uninstall a subscriber identity module (SIM) card of a global system for mobile communications (GSM) service subscriber, and the card interface can detect whether the SIM card is installed in the cardholder such that the same cardholder is capable of alternately receiving both the SIM card and the UIM card, and when the card interface detects that the SIM card of the GSM service subscriber is installed in the cardholder in the CDMA service area, specific data are transmitted using a CDMA message in the case of authenticating the GSM service subscriber using information of the GSM service subscriber stored in the SIM card, and when the authentication of the GSM service subscriber is normally completed, the CDMA terminal operates as a roaming terminal for the GSM service subscriber in the CDMA service area.