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A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other private networks.
most telephone numbers are assigned to one telephone line or one mobile telephone and most lines or mobiles have one numbera telephone number serves as an address for switching telephone calls using a system of destination routingtelephone numbers are entered or dialed by a calling party on the originating telephone set which transmits the sequence of digits in the process of signaling to a telephone exchangethe exchange completes the call either to another locally connected subscriber or via the pstn to the called partyn 1961 the new york telephone company introduced selected letter exchanges in which the two letters did not mark the start of any particular name example lt 1 7777 once the number of the main switchboard at abc and by 1965 all newly connected phone numbers nationwide consisted of numerals only