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2. MCI Communications - Wikipedia

   en.wikipedia.org/wiki/MCI_Communications

   MCI Communications Corporation (originally Microwave Communications, Inc.) was a telecommunications company headquartered in Washington, D.C. that was at one point the second-largest long-distance provider in the United States. MCI was instrumental in legal and regulatory changes that led to the breakup of the Bell System and introduced ...

3. Email Support-AOL Help

   help.aol.com/email-support

   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.

4. Ringback number - Wikipedia

   en.wikipedia.org/wiki/Ringback_number

   Ringback number. A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting. [1]

5. Bell System - Wikipedia

   en.wikipedia.org/wiki/Bell_System

   Bell System. The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company (AT&T), that dominated the telephone services industry in North America for over 100 years from its creation in 1877 until its antitrust breakup in 1983.

6. 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.

7. 800 MHz frequency band - Wikipedia

   en.wikipedia.org/wiki/800_MHz_frequency_band

   The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before changing to digital terrestrial television in many ...