At 10:54 AM 11/13/2004, you wrote:
I was never in on the busy signal thing, but I did do something similar. Telephone numbers that had the suffix beginning with 99 were designated as "official" numbers for internal phone company use. As I recall, you could dial xxx-9929 and have a friend dial xxx-9930, and the two of you could hold a conversation.
Thats known as a loop. Lots of them out there but most are muted so you can't talk on them. Other prefix exchanges worked too. The other fun thing is to find a bridge which is a bunch of numbers toed together so several people could be on at once. I used to be a phone phreak in my younger days back when the blue box (for free long distance called) used to work.
Alan WA2DZL
The coin sounds in a payphone is called a red box. Doesn't work on COCOT (customer owned) payphones because the dialtone you hear is not from Ma Bell's line but generated by the phone.
