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As there ain't no split plans the last 9 years, adding area codes are overlays. |
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Split plans are used as growth in demand for telephone numbers (due to the increase in use of pagers, fax machines, and cellular phones) require new area codes in increasingly densely populated areas. Unpopularity results from the fact that, after a split plan is implemented, the telephone numbers in an affected area are changed to a new area code, requiring printing of new [[stationery]], advertisement, and signage, and the dissemination of new numbers to family, friends, and customers and their subsequent need to update speed dial programming and address books.
As a result, in the mid-1990s, the [[North American Numbering Plan]] introduced [[overlay plan]]s, which apply multiple area codes to the same area. They allow customers to keep existing phone numbers, but require [[10-digit dialing]] in the affected area. Since 2007 many territories
==See also==
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