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Not withstanding the desire for long-term stability of the local numbering plan and customer understanding, rapid growth in some areas has resulted in many splits within just a few years.
As a result, in the mid-1990s, the [[North American Numbering Plan]] Administrator introduced another method for exhaustion relief, the [[area code overlay]]. This method assigns multiple area codes to the same numbering plan area, so that existing subscribers can keep established telephone numbers. Only new accounts and extra lines receive telephone numbers with the new area code. This method requires [[ten-digit dialing]] for customers of both area codes, even for local calls. Since 2007, most territories use overlays for mitigating numbering shortages. Most area code relief plans today do not even consider splits as relief options, limiting options to overlay plans.<ref>https://www.nationalnanpa.com/reports/2021_NANPA_Annual_Report.pdf {{Bare URL PDF|date=May 2022}}</ref>
==See also==
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