Note that the first one detects all combinations of space and dash as delimiter where the format still isn’t +1-NNN-NNN-NNNN. Similarly, the country code for the United States is 1, while the country code for Canada is 1 as well. After a period of several months, mandatory dialing begins, when seven-digit dialing is no longer permissible. The NANPA is responsible for ensuring that area codes and exchanges are assigned and utilized efficiently to meet the growing demand for telephone service.

Although the limitation to 540 central offices required the most populous states to be divided into multiple NPAs, it was not the sole reason to subdivide a state. For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678.This rule was violated by the early 1950s, [22] as NPAs with digit 0 in the middle had to be divided, but until 1995 all area codes assigned had none other than the digits 0 and 1 in this position. Within this system, the NPA-NXX provides detailed information about the origination of a telephone number.

Additionally, many Caribbean territories have implemented local government agencies to regulate telecommunications rates of providers. In particular, the content does not constitute any form of advice, recommendation, representation, endorsement or arrangement by FT and is not intended to be relied upon by users in making (or refraining from making) any specific investment or other decisions. The status of the network of the 1960s was represented by a new name used for technical documentation: North American Integrated Network. The Federal Communications Commission (FCC) also plays a role in the administration of NPA NXX codes. My Country Mobile understands the importance of providing consumers with the ability to keep their phone numbers and is committed to maintaining efficient and effective LNP practices.The first digit of the area code identifies the geographic area, while the second and third digits represent a specific central office or exchange within that area. Determining that 911 requires unnecessary rotation time on rotary dial telephones, the European Union has adopted its own standardized number of 112, while countries in Asia and the rest of the world use a variety of other two- or three-digit emergency telephone number combinations.

Don’t know if it has some sort of AI routine learning what the most common formats are for numbers of different digit counts and if with city 0 prefix (has to be dialed even from abroad) or without for mobile numbers. Due to the proliferation of service providers in some numbering plan areas, many area codes were threatened with exhaustion of numbering resources. The NANP numbering format may be summarized in the ten-digit notation NXX NXX-XXXX, where N denotes any of the digits 2–9, and X denotes any digit 0–9.In an overlay, multiple codes are assigned to the same geographical area, obviating the need for renumbering of existing services. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN). Similarly, several Caribbean area codes were chosen as an alphabetic abbreviation of the name of the country or its capital.