Method of tracking stolen mobile device connected to wireless or wired network

A mobile device connected to a wireless or wired network comprising:

• a tracking control module which controls a lost mobile device for tracking the lost mobile device;
• a memory which stores a warning message, information regarding a destination of the warning message, and user identity information;
• a display module which displays the state of the mobile device;
• a SIM/USIM interface module into which a user identity card is inserted;
• a network access module which connects the mobile device to a network in a wireless or wired manner;
• when a new user identity card is inserted into the mobile device, comparing user identity information stored in the new user identity card with the stored user identity information and automatically transmitting the warning message to the destination of the warning message if the user identity information stored in the new user identity card is not identical to the stored user identity information;
• and
• a processor which controls the mobile device, wherein the tracking control module is activated, after a user inputs a user password, and the user inputs content of the warning message and the destination of the warning message that are stored in the memory,
• wherein the user password is required when accessing or editing the password, when accessing or editing the content of the warning message, and when accessing or editing the destination of the warning message,
• wherein if an outgoing call/SMS barring option is set in the mobile device,
• checking changes in a status of the outgoing call/SMS barring option at regular intervals, and
• transmitting the warning message to the destination of the warning message when detecting the status of the outgoing call/SMS barring option as canceled,
• wherein the content of the warning message includes current location of the user, Mobile Station International Subscriber Directory Number/International Mobile Subscriber Identities (MSISDN/IMSI), and text input by said user.