Samsung Electronics Co., Ltd.

Kyung-Yun Roo

Jeon-Man Park

Youn-Man Lee

Yong-Duck Hwang

Disclosed is a method for locking and unlocking a mobile telephone. The method comprises setting a locking mode by receiving a locking voice, a locking-wait time and a locking number; receiving a locking voice when there is a key input in the locking mode; partially releasing the locking function when the received locking voice is identical to a registered locking voice; switching an operation mode of the mobile telephone to an idle mode, after partially releasing the locking function; and switching the operation mode of the mobile telephone back to the locking mode, when there is no key input in the idle mode until the locking-wait time has elapsed.

Locking and unlocking method in mobile telephone

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.

Method and system for using SIM card in CDMA service area

A location search auxiliary system used in a cellular radio telephone. The location search auxiliary system includes an auxiliary battery and a search signal receiver. If the cellular radio telephone is not equipped with a main battery or if the main battery mounted therein is substantially discharged, the search signal receiver is operated by power from the auxiliary battery. If a search signal is transmitted to the search signal receiver, the cellular radio telephone generates an alarm tone or a voice message indicating that it is a missing telephone.

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Kyongsangbuk-do, South Korea

Kyung-Yun Roo