When an area code split takes place, some of the prefixes remain with the old area code and some move to the new area code. Where can that information be found?
When a new area code is assigned, NANPA issues a planning letter that provides an overview of how the new code will be used. If the new area code will be used for a split, and if the list of prefixes is available, it will be included. The planning letter typically contains prefix lists, maps, dialing plans, and key dates.
Related Questions
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