Abstract: In a method of indicating unauthorized use of a mobile terminal, subscriber identification data of an owner's subscriber identification module card installed within the mobile terminal is stored in a memory unit. The owner of the mobile terminal sets a caller alert group that includes a call number associated with the subscriber identification module card of the owner of the mobile terminal. During subsequent activation of the mobile terminal, the mobile terminal establishes a communications link with a communications network in accordance with a subscriber identification module card installed within the mobile terminal. When the subscriber identification data stored in the memory unit of the mobile terminal does not match that of the subscriber identification module card installed within the mobile terminal, the mobile terminal sends a message to the caller alert group via the communications network.