phreaking

phreaking /freek'ing/ n.  [from `phone phreak'] 1. The
   art and science of {cracking} the phone network (so as, for
example,
   to make free long-distance calls).  2. By extension,
   security-cracking in any other context (especially, but not
   exclusively, on communications networks) (see {cracking}).

   At one time phreaking was a semi-respectable activity among
   hackers; there was a gentleman's agreement that phreaking as an
   intellectual game and a form of exploration was OK, but serious
   theft of services was taboo.  There was significant crossover
   between the hacker community and the hard-core phone phreaks who
   ran semi-underground networks of their own through such media as
   the legendary "TAP Newsletter".  This ethos began to break
   down in the mid-1980s as wider dissemination of the techniques put
   them in the hands of less responsible phreaks.  Around the same
   time, changes in the phone network made old-style technical
   ingenuity less effective as a way of hacking it, so phreaking came
   to depend more on overtly criminal acts such as stealing phone-card
   numbers.  The crimes and punishments of gangs like the `414 group'
   turned that game very ugly.  A few old-time hackers still phreak
   casually just to keep their hand in, but most these days have
   hardly even heard of `blue boxes' or any of the other
   paraphernalia of the great phreaks of yore.