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2. Long-distance calling - Wikipedia

   en.wikipedia.org/wiki/Long-distance_calling

   Some of these plans can be found on websites that compare a variety of long-distance phone and phone card options, giving consumers useful and timely information. Long-distance calls were once "special" and costly. Costs declined and by 2004, "unlimited telephone packages" were available.

3. 10-10-321 - Wikipedia

   en.wikipedia.org/wiki/10-10-321

   10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.

4. Operator Toll Dialing - Wikipedia

   en.wikipedia.org/wiki/Operator_Toll_Dialing

   By the end of 1948, AT&T commenced the wider use of the system with the cutover of new crossbar switching systems for toll-dialing in New York and Chicago, [4] which resulted in the handling of about ten percent of all Bell System long-distance calling by Operator Toll Dialing. [5]

5. General Toll Switching Plan - Wikipedia

   en.wikipedia.org/wiki/General_Toll_Switching_Plan

   The General Toll Switching Plan was a systematic nationwide effort by the American Telephone and Telegraph Company (AT&T) of organizing the telephone toll circuits and cable routes of the nation, and of streamlining the operating principles and technical infrastructure for connecting long-distance telephone calls in North America. [1]

6. Original North American area codes - Wikipedia

   en.wikipedia.org/wiki/Original_North_American...

   The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by

7. PSTN network topology - Wikipedia

   en.wikipedia.org/wiki/PSTN_network_topology

   PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...