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  2. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    This mid- to late-1950s telephone dial displays the name of telephone exchange Kenmore, in the South Side of Fort Wayne, Indiana. The telephone number of this station is K-9293. Since the letter K is emboldened, it was a required component of the telephone number, dialed as the digit 5, as the red lettering indicates.

  3. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    For most cities, this conversion required the addition of extra digits or letters to the existing central office prefix. For example, the Atlantic City, New Jersey, telephone number 4-5876 was converted to AT4-5876 during the 1950s. Complete replacement of existing prefixes was necessary in the case of conflicts with another office in the state.

  4. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by ...

  5. Party line (telephony) - Wikipedia

    en.wikipedia.org/wiki/Party_line_(telephony)

    For rural residents, many were on a single telephone line identified by a number and a property name, such as "Gundabluie 1". Each party on that single line was identified by a letter, and the ringing pattern for that party would consist of the corresponding letter in Morse code. This distinctive ring would alert all parties on the line who the ...

  6. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    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 – this replaced rotary dialing , that had been developed for ...

  7. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    The Australian letter-to-number mapping was A=1, B=2, F=3, J=4, L=5, M=6, U=7, W=8, X=9, Y=0, so the phone number BX 3701 was in fact 29 3701. When Australia around 1960 changed to all-numeric telephone dials, a mnemonic to help people associate letters with numbers was the sentence, "All Big Fish Jump Like Mad Under Water eXcept Yabbies."

  8. History of telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/History_of_telephone...

    Letters were assigned to each number from 2 to 0 on the telephone dial and a three-digit code, represented by letters, identified the local exchange. Telephone numbers were displayed preceded by the exchange name, with the first three letters highlighted to indicate the code, and number, such as WHI tehall 1212 .

  9. Zenith number - Wikipedia

    en.wikipedia.org/wiki/Zenith_number

    The letter Z appeared on many telephone dials from the early 1930s to the 1950s at the same position as the label Operator with the digit 0, indicating that the caller had to call the operator to place the call. The operator looked up the Zenith number to find the corresponding city and directory telephone number, and completed the call by ...