Individual security subscriber line module including a generally rectangular, hollow box-like structure including a top, bottom, opposed sides and opposed first and second ends, such structure providing an internal space for receiving an individual circuit; a pair of subscriber wiring terminals mounted on the top for connection to a subscriber line, a plug connected to the pair of subscriber wiring terminals by first electrical conductors; a jack mounted on the top and provided with second electrical conductors for connecting the jack to the incoming telephone company line, the jack for having the plug plugged therein to interconnect the pair of subscriber wiring terminals and thereby the subscriber line to the incoming telephone company line and the plug for being unplugged from the jack to provide a demarcation point between the subscriber line and incoming telephone company line, and upon the plug being unplugged from the jack the jack for receiving the plug of an operating telephone to facilitate determination of whether a fault exists on the subscriber line or the incoming telephone company line; and mounting structure for mounting the module removably to a telephone network interface apparatus for ready removal. The individual subscriber line module may be provided with an individual security cover mounted pivotally on one end of the top of the box-like structure and for being covering and being locked over the pair of subscriber terminals, and may include safety structure for preventing ringing voltage shock hazard to the subscriber.