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020; 021; Turkmenistan, alongside the standard prefix 8~10 for the default carrier 008; 009; 010; 10xx, where xx is a two-digit carrier selection code: Georgia, alongside the standard prefix 00 for the default carrier; 8~xx, where xx is a two-digit carrier selection code: Russia, alongside the standard prefix 8~10 for the default carrier 8~26 ...
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.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
Z=2 and 3 means a landline number; the YX code is 1 (with extra digit for local number) for Bucharest, from 30 to 69 for a county code, and 70 to 79 for non-geographic landline numbers; Z =7 (and possibly 6 in the future) means a mobile number; 070p-xxxxxx numbers are reserved for virtual operators, while 071p-xxxxxx to 079p-xxxxxx are reserved ...
Ten-digit non-geographic numbers beginning with 1 are written 1X0Y BBB BBB, where X = 8 for toll free numbers, X = 3 for fixed-fee numbers and X = 9 for premium services. Six-digit non-geographic numbers are written 13 BB BB or 13B BBB; these are fixed-fee numbers. Seven-digit 180 BBBB numbers also exist. 'B's are sometimes written as letters.
The use of numbers starting in 555-(KLondike-5) to represent fictional numbers in U.S. movies, television, and literature originated in this period. The "555" prefix was reserved for telephone company use and was only consistently used for directory assistance (information), being "555–1212" for the local area.
Calling codes in Europe. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code starting on number 2, which is most ...
Computable number: A real number whose digits can be computed by some algorithm. Period: A number which can be computed as the integral of some algebraic function over an algebraic domain. Definable number: A real number that can be defined uniquely using a first-order formula with one free variable in the language of set theory.