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Area code 231 was created in June 1999 by an area code split of area code 616, which had served the entire western half of the Lower Peninsula, extending west from the north-south line aligned with the Mackinac Bridge. 231 was carved out of the northern part.
1999: Area code 231 was created in the second split of 616. 2001: Area code 586 was created in the second split of 810, and area code 989 was created in the first split of 517. 2002: Area code 269 was created in the third split of 616, while area code 947 was created as an overlay of 248.
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). 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.
+231: International access: 00: The following are the telephone codes in Liberia. Calling formats. The NSN length is 7, 8 or 9 digits, depending on the number type.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). 7 Claro 8: Instituto Costarricense de Electricidad (Kölbi) Croatia +385: 91: 9: A1 Hrvatska: Due to Mobile number portability the prefix of an existing number does not determine the carrier. Any new number will follow the ...
For most cities, this conversion required the addition of extra digits or letters to the existing central office prefix. For example, the Atlantic City, New Jersey, telephone number 4-5876 was converted to AT4-5876 during the 1950s. Complete replacement of existing prefixes was necessary in the case of conflicts with another office in the state.