Telephone numbers

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numbering scheme for dialing telephones

unique sequence of digits assigned to a telephone subscription

book that lists phone numbers of people and businesses

telephone number prefix in the international telephone numbering plan

service providing immediate emergency telephone counseling

thumb | right | alt=Diagram showing Mobile Subscriber Integrated Services Digital Network (MSISDN) number | Mobile Subscriber Integrated Services Digital Network (MSISDN) number MSISDN () is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network. It is the mapping of the telephone number to the subscriber identity module in a mobile or cellular phone. This abbreviation has several interpretations, the most common one being "Mobile Station International Subscriber Directory Number".

integrated telephone numbering plan serving 20 North American countries which share its resources

type of telephone number where the provider thereof is billed instead of the calling party

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time of day voice service

system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces

keypad that appears on a "Touch Tone" telephone

thumb|right|Many telephone keypads have letters with the numbers, from which words can be formed. thumb|Sign in Argentina giving the number 0800 555 8736 as 0800 555 TREN Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. In many countries, the digits on the telephone keypad also have letters assigned. By replacing the digits of a telephone number with the corresponding letters, it is sometimes possible to form a whole or partial word, an acronym, abbreviation, or some other alphanumeric combination.

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telecommunications technology

E.161 is an ITU-T Recommendation that defines the arrangement of digits, letters, and symbols on telephone keypads and rotary dials. It also defines the recommended mapping between the basic Latin alphabet and digits (e.g., "DEF" on 3). Uses for this mapping include:

E.123 is an international standard by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T), entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes.

A phone number that has the uses of a physical number and a SIM card, but is virtual.

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Kurt Vonnegut short story first published in 1962

Type of freephone service in the European Union

telephone numbers for calls that are charged at a higher than normal rate

Asian telephone numbers