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A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...
Toll-free telephone number. A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code.
This changed in 1998, with a transition period lasting from 19 June to 31 December. The new dialing procedures require dialing the full number for all calls. The main advantage is the availability of millions of previously reserved phone numbers. The change was widely advertised with a campaign named "Fissa il prefisso" ("Attach the prefix").
The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
In mainland China, mobile phone numbers have eleven digits in the format 1xx-XXXX-XXXX (except for 140–144, which are 13-digit IoT numbers), in which the first three digits (13x to 19x) designate the mobile phone service provider. Before GSM, mobile phones had 6-digit (later upgraded to 7-digit) numbers starting with nine.
An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i2 = −1. [1] [2] The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]
0, 009. Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number. Area codes consist of one digit ( Lagos, Ibadan and Abuja) or two digits. Local telephone numbers contain from five to seven digits, and may vary within the area code.
The operator is obtained via 100 from landlines, while directory enquiries, formerly 192, is now provided in the 118xxx range, (not to be confused with 0118, the area code for Reading.) e.g. 118 212, 118 800, 118 500, 118 118, by different companies. International operator assistance is reached through 155 .
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