Didn't you have to clip a resistor in the handset or something to make a red box work? Another film comes to mind: Hackers. "It's in that place where I put th

Didn't you have to clip a resistor in the handset or something to make a red box work? Another film comes to mind: Hackers. "It's in that place where I put that thing that time." There was a payphone installed in the vestibule of my high school.