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2. Telephone number - Wikipedia

   en.wikipedia.org/wiki/Telephone_number

   A telephone number is a sequence of digits assigned to a landline 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 public and private networks.

3. National Number Group - Wikipedia

   en.wikipedia.org/wiki/National_Number_Group

   The UK Public Switched Telephone Network is divided up by area into National Number Groups (NNG's), and then further divided up into dialling codes.. The structure of UK telephone numbers is a leading zero (replaced with +44 for international calls from outside the UK) followed by the NNG — a 2, 3, 4 or 5 digit dialling code (digits SA in the example below) to different geographic areas of ...

4. AOL Help

   help.aol.com

   Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

5. Telephone numbers in Gibraltar - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Gibraltar

   The Gibraltar telephone numbering plan is the system used for assigning telephone numbers in the British Overseas Territory of Gibraltar. It is regulated by the Gibraltar Regulatory Authority (GRA), which holds responsibility for telecommunications . The country calling code to Gibraltar is +350, which was assigned to the territory by the ...

6. Telephone numbers in Norway - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Norway

   Telephone numbers in Norway. Telephone numbers in Norway have the country code "+47" and up to the first 2 digits of the phone number will indicate its geographic area. Emergency services are 3 digits long and start with the number "1". Mobile numbers vary in length, either 8 digits or 12 digits.

7. History of the telephone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_telephone

   Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...