Abstract: A method for preventing an illegal use of a mobile communication terminal includes the steps of: transmitting a short message service (SMS) message to a lost terminal when a user requests a phone-locking service; and analyzing the received SMS message to set a phone-locking state for the lost terminal. When a terminal is lost, an SMS message containing a ciphered string is transmitted to the lost terminal to set a phone-locking or forcefully turn off an LCD power, so that the lost terminal can be prevented from illegally using by a third party or a stranger and user's personal information can be effectively prevented from leaking.

Abstract: A method for preventing an illegal use of a mobile communication terminal includes the steps of: transmitting a short message service (SMS) message to a lost terminal when a user requests a phone-locking service; and analyzing the received SMS message to set a phone-locking state for the lost terminal. When a terminal is lost, an SMS message containing a ciphered string is transmitted to the lost terminal to set a phone-locking or forcefully turn off an LCD power, so that the lost terminal can be prevented from illegally using by a third party or a stranger and user's personal information can be effectively prevented from leaking.

Abstract: A method for controlling phone-locking of a mobile communication terminal which is capable of preventing a stranger from using freely a user's terminal in case that the user's terminal is lost in a state that a phone locking function of the terminal has not been set. The method for controlling phone-locking of a mobile communication terminal includes the steps of: receiving a phone-locking request signal form a user; transmitting an order message for phone-locking to a lost terminal, when the phone-locking request signal is received; and setting a phone-locked state for the lost terminal according to the transmitted order message for phone-locking.