A service class control system comprising a service class control server and a plurality of terminal devices (2-k) connected to the service class control server via a wireless telephone network; wherein the service class control server comprises: means for storing, for each terminal device, service class data indicative of a range of service served by the terminal device; and means for retrieving, from the means for storing, a service class data associated with an identification data for identifying the terminal device, and for transmitting the retrieved service class data to the terminal device as a data indicative of a range of service which the terminal device can serve, in response to the identification data which is received from the terminal device and identifies the terminal device, when the terminal device requires a start of providing a service; and wherein the terminal device comprises means for: obtaining and storing the retrieved service class data indicative of the range of service which the terminal device itself can serve, when the terminal device receives the retrieved service class data from the service class control server, and provides services lying within the range indicated by the stored service class data; characterized in that said terminal device comprises means for: transmitting the service class data stored in the terminal device and the identification data for identifying the terminal device to the service class control server in response to reception of an interrogation signal via the wireless telephone network; and the service class control server comprises means for: retrieving, from the means for storing, a service class data associated with the identification data which the terminal device has transmitted in response to reception of the inter-rogation signal, and verifies match among the retrieved service class data and the service class data which the terminal device has transmitted in response to reception of the interrogation signal. means for storing, for each terminal device, service class data indicative of a range of service served by the terminal device; and means for retrieving, from the means for storing, a service class data associated with an identification data for identifying the terminal device, and for transmitting the retrieved service class data to the terminal device as a data indicative of a range of service which the terminal device can serve, in response to the identification data which is received from the terminal device and identifies the terminal device, when the terminal device requires a start of providing a service; and obtaining and storing the retrieved service class data indicative of the range of service which the terminal device itself can serve, when the terminal device receives the retrieved service class data from the service class control server, and provides services lying within the range indicated by the stored service class data; transmitting the service class data stored in the terminal device and the identification data for identifying the terminal device to the service class control server in response to reception of an interrogation signal via the wireless telephone network; retrieving, from the means for storing, a service class data associated with the identification data which the terminal device has transmitted in response to reception of the inter-rogation signal, and verifies match among the retrieved service class data and the service class data which the terminal device has transmitted in response to reception of the interrogation signal.