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In telephony, an ERC is an easily-recognizable code for the North American Numbering Plan. This applies to all area codes that end in double digits, such as 800, 877, 900, 700, and others not yet assigned. The state of Nevada requested that its new area code be "lucky" 777; this was denied by NANPA because it is an ERC, to be used only for special purposes like inward WATS -- they were granted 775, instead. Another such 'vanity' NPA code has now been assigned to the Titusville/Space Coast area of Florida: 321.
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