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  2. Call signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Call_signs_in_the_United...

    The initial assignment allocated all call signs starting with "N" and "W", plus the range KDA-KZZ, for use by the United States. [29] (Initially KAA-KCZ were assigned to Germany, but in 1929 this call letter block was transferred to the United States. AAA-ALZ were added after World War II.)

  3. Call sign - Wikipedia

    en.wikipedia.org/wiki/Call_sign

    Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).

  4. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  5. Call signs in North America - Wikipedia

    en.wikipedia.org/wiki/Call_signs_in_North_America

    The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a prefix assigned by the International Telecommunication Union (ITU). For example, the United States has been assigned the following prefixes: AAA – ALZ , K , N , W .

  6. List of telephony terminology - Wikipedia

    en.wikipedia.org/wiki/List_of_telephony_terminology

    Number 1 Electronic Switching System (Alcatel-Lucent) US 1FR: Flat rate service: US 2G: second-generation mobile telephone 2.5G: Enhanced 2G mobile telephone 3G: third-generation mobile telephone 4ESS Number 4 Electronic Switching System (Alcatel-Lucent) 4WTS: Four-wire termination set: US 5ESS Number 5 Electronic Switching System (Alcatel ...

  7. Phoneword - Wikipedia

    en.wikipedia.org/wiki/Phoneword

    The differences between the prefixes are the length of the number (six or ten digits), the license cost to use them each year (approximately A$1 for 1800 and 1300, A$10,000 for 13 numbers) and the call cost model. 1300 numbers [8] and 13 numbers share call costs between the caller and call recipient, whereas the 1800 model offers a national ...

  8. This is why you should never call back an unknown number - AOL

    www.aol.com/article/lifestyle/2019/05/03/this-is...

    So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.

  9. Broadcast call signs - Wikipedia

    en.wikipedia.org/wiki/Broadcast_call_signs

    Calls beginning with PM are then followed by a number indicating the province where the station is in, the letters B, C, D and F (B for AM stations, C for some stations in Kalimantan, D for some stations in Sumatra, and F for FM stations), and two unique characters. Television stations in Indonesia never use call signs, and their use is ...