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Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
NPA-911 is forbidden as 9-1-1 is an emergency telephone number. (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.) NPA-555 is reserved in every toll-free area code (except 800) for future information or directory assistance applications
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, ... where the telephone prefixes include 288.
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes
This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix. For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange.
Look at the area code: Start by comparing the phone number’s area code to the list of area codes you should never answer. If it’s on the list, there’s a good chance there’s a scammer on ...
Callers in a given area sometimes do not need to include area prefixes when dialing within the same area, but devices that dial telephone numbers automatically may include the full number with area and access codes. The subscriber number is typically listed in local telephone directories, and is therefore often referred to as the directory number.
A phone number communicates a lot --and if you dig a little deep, an area code contains information about the economic situation of its residents, too.