Patent ID: 7505758

Claim:
A method for restricting a use of a mobile terminal, comprising: inserting a user authentication card into the mobile terminal; generating a coded value by masking an Electronic Serial Number (ESN) value and an Internet Mobile Station Identity (IMSI) value of the user authentication card with a serial number of the mobile terminal and by adding the masked ESN and IMSI values and a checksum bit; and determining whether or not the mobile terminal is available for use based on the generated coded value, wherein determining whether or not the mobile terminal is available for use includes: determining whether or not the generated coded value is on a registration coded value list that identifies registered coded values, each registered coded value being based on information of a user authentication card and a mobile terminal, determining whether or not the generated coded value is on a prohibition coded value list in response to the determination that the generated coded value is not on the registration coded value list, the prohibition coded value list being different than the registration coded value list, storing the generated coded value in a temporary coded value list and setting the mobile terminal in a first lock mode in response to the determination that the generated coded value is not on the registration coded value list and the determination that the generated coded value is not on the prohibition coded value list, the temporary coded value list being different than the prohibition coded value list and different than the registration coded value list, automatically storing the coded value in the registration coded value list in response to the mobile terminal not receiving a message restricting use of the mobile terminal after a specific period of time from when the mobile terminal stores the generated coded value in the temporary coded value list, and changing the mobile terminal from the first lock mode to a second lock mode when the mobile terminal has been reported lost and the generated coded value is stored in the temporary coded value list, the second lock mode being different than the first lock mode.