I'm not doing the math, but I do recall that time on those phones was _very_ expensive. Dollars per minute. And, in those days if you didn't press the 'end' bu

I'm not doing the math, but I do recall that time on those phones was _very_ expensive. Dollars per minute. And, in those days if you didn't press the 'end' button to terminate the call, regardless of the other party hanging up, it kept an open line. I remember my dad getting several hundred dollar bills related to saying 'bye' and tossing the phone onto the passenger seat.