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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.
The numbering plan area (NPA) includes the state capital, Springfield, and Champaign, Urbana, Decatur, Taylorville, Lincoln, Danville, Effingham, Quincy, Rantoul, and Jacksonville. 217 was one of the original North American area codes created in 1947 and 447 was added to the same area in 2021 to form an all-services overlay.
Research and Academic Computer Network (NASK) State Research Institute - National Domain Register - the Polish country code top-level domain register, member of Council of European National Top Level Domain Registries and Country Code Names Supporting Organization (in English) [175] (searchable) GS1 Poland Foundation - assigns the GTIN/EAN codes
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
Area codes in the United States by state or territory ... Toll-free telephone number; 0–9. ... Area codes 217 and 447; Area code 218; Area code 219;
The purpose, rather than to standardize state abbreviations per se, was to make room in a line of no more than 23 characters for the city, the state, and the ZIP code. [4] Since 1963, only one state abbreviation has changed.