telephone number
unique sequence of digits assigned to a telephone subscription
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A Swiss rotary telephone dial from the 1970s showing the telephone's number (94 29 68), along with those of various local emergency services
Telephone numbers for sale in Hong Kong A telephone number is the address of a telecommunication endpoint, such as a telephone, in a telephone network, such as the public switched telephone network (PSTN). A telephone number typically consists of a sequence of digits, but historically letters were also used in connection with telephone exchange names.