disclosed are a device and a method of transmitting sos signals in a mobile telecommunication terminal . the method according to the invention includes the steps of converting each of a plurality of sos phrases stored in the mobile telecommunication terminal with code signals of a corresponding format , and storing the converted codes , providing a user with a menu to select one of the sos phrases upon entry into an sos service mode , modulating the code signal of the corresponding format selected by the user from the menu into a frequency of the corresponding bandwidth , and transmitting the modulated signal .