Red box

A red box is a device that people used illegally in the 20th century to make free telephone calls at a payphone. It worked by playing back the same sounds that the payphone sends to the phone company when coins are put into it.

Related pages
Blue box

 Other websites 
 "Frequently Asked Questions About Red Boxing" by Mr. Sandman
 All about the Red Box and related devices 
 Red Boxing For Dummies 

Category:Telephone
category:Electronics