Abstract: Systems and methods for restricting the use and movement of plain old telephone system (POTS) devices and cellular telephones are presented. In a broad sense, the system includes an interface configured to only allow telephone calls to a limited set of telephone numbers or area codes. The interface may be configured to detect a telephone number during a call attempt and compare the number to a stored sequence list of allowed telephone numbers or area codes. If the detected number matches one of the allowed telephone numbers or area codes, the call attempt is allowed to continue. However, if the detected number does not match a number in the stored sequence list, the call attempt is blocked by the interface. The interface may also be configured to restrict the movement of a cellular telephone based on received location data indicating a current position of the cellular telephone.