are phone area codes
In the US and its territories, Canada, and the Caribbean, the organization and allocation of telephone numbers is governed by the North American Numbering Plan Administration (NANPA). The NANPA organizes the allocation of area codes and telephone prefixes to various phone companies.The basic format of a phone number in any of these countries is NPA-NXX-XXXX or (NPA) NXX-XXX. NPA codes are more commonly referred to as area codes. Some area codes are reserved for special purposes.he basic format of a phone number in any of these countries is NPA-NXX-XXXX or (NPA) NXX-XXX. NPA codes are more commonly referred to as area codes.