![]() By the end of 1999, California had 25 area codes statewide, and because of inefficient management of telephone numbers, the industry projected we would need 17 more area codes by the end of 2002. During the next three years, however, the number of area codes in California nearly doubled. The traditional system did not lend itself to efficient distribution of numbers in a competitive market where numbers are assigned to multiple carriers to serve customers in each rate center.įrom 1947 to January 1997, the number of area codes in California increased gradually from 3 to 13. Yet, with the opening of the local exchange market to competition, together with the growth in the competitive market for wireless and advanced technological telecommunications services, the traditional number assignment system could no longer keep up with the growing demand for numbers from multiple carriers serving the same customer base. ![]() ![]() That system worked reasonably well as long as only one incumbent local exchange carrier required telephone numbers. Under the traditional system, a carrier wishing to serve only a few customers in an area was allocated telephone numbers in blocks of 10,000 for each rate center in that area. The traditional system for assigning numbers was a legacy from an era in which one incumbent telephone company provided all customers with local service in a given area code.
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