Numbering Plan Area (NPA)An NPA is referred to as an area code.
The plan divided most of North America into eighty-six numbering plan areas (NPAs). Each NPA was assigned a unique three-digit code, typically called NPA code or simply area code. These codes were first used in Operator Toll Dialing by long-distance operators in establishing calls between toll offices.
Area Codes in Australia
| # | Area Name | Area Code |
|---|
| 1 | New South Wales | (0)2 |
| 2 | North east region | (0)7 |
| 3 | Northern Territory | (0)8 |
ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.
A telephone prefix, also called an exchange code or central office code, is a three-digit code that identifies a much smaller region within an area code. The prefix can refer to a specific city or a section of a city.
For customers of some telephone companies in Canada and in the U.S., 6-1-1 is the abbreviated dialing telephone number used to report a problem with telephone service, or with a payphone. It is an N11 code of the North American Numbering Plan that are used for special services.
The first and third digits were allotted according to population density in the city or region the area code was going to, with the most populated areas getting the lowest numbers. The New York City area, for example, was assigned 212, while the surrounding suburbs were assigned 914.
Area codes were initially assigned to phone numbers based on the volume of telephone calls made in each area. The most populous areas such as Birmingham, Edinburgh, Liverpool and Manchester were assigned the area codes that required the least time for dialling using a rotary dial telephone.
In North America, no area codes or office codes start with 0; if you see 012–345–6789 or 012–3456, the numbers are likely spoofed. In most of Europe and Asia, a 0 precedes the area code.
And so, 3 more digits were added to the front of the numbers, referred to as an “area code” – the next evolution of the original North American Numbering Plan. What was the first area code?
In total, the number of people that own a smart and feature phone is 4.88 Billion, making up 61.90% of the world's population.
Number Of Smartphone & Mobile Phone Users Worldwide (Billions)
| Number of smartphones | Number of mobile phones |
|---|
| 2021 | 3.8 | 4.88 |
| 2020 | 3.5 | 4.78 |
| 2019 | 3.2 | 4.68 |
| 2018 | 2.9 | 4.57 |
A rate center is a geographical area used by a Local Exchange Carrier (LEC) to organize the boundaries for local calling, billing and assigning of phone numbers. A call within a rate center is typically considered a local call, while a call from one rate center to another is a long-distance call.
There are already some 700 million numbers that have been allocated to mobile phone operators and the appetite to recycle old numbers means that new numbers are added to the increasingly large number in existence.
This random jump of numbers is because geography didn't determine area code designations—population density did. The Bell System, formerly a system of companies led by the Bell Telephone Company, created the first area codes back in the 1940s called the North American Numbering Plan.
According to forecasts by the North American Numbering Plan Administrator — that's the official clearinghouse for area codes in the U.S., Canada and some Caribbean countries — D.C.'s (202) phone numbers could run out as early as the second quarter of 2023.
History. In 1947, when the American Telephone and Telegraph Company (AT&T) devised the initial form of the North American Numbering Plan, the state of California was divided into three numbering plan areas: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. If repetition is allowed, then the number of permutations of 10 digits is 10,000,000,000.
