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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...

  3. Who still owns a landline phone? You might be surprised at ...

    www.aol.com/still-owns-landline-phone-might...

    Only about 5% of the households AT&T serves use copper-based landlines, a company spokesperson said. Most landlines now make calls through an internet connection.

  4. Category:Defunct telecommunications companies of the United ...

    en.wikipedia.org/wiki/Category:Defunct...

    Defunct mobile phone companies of the United States (2 C, 32 P) I. ... AT&T Communications (1984–2010) AT&T Corporation; Atlantic and Pacific Telegraph Company;

  5. Is AT&T cell service down? Why is my phone on SOS? What ... - AOL

    www.aol.com/t-cell-down-why-phone-160550727.html

    Reports of AT&T cell outages peaked this morning just after 7 a.m. on DownDetector, a site that tracks issues with various services from user reports. The number had dropped by 11 a.m., but still ...

  6. Ringback number - Wikipedia

    en.wikipedia.org/wiki/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.

  7. FCC's Homeland Security Bureau investigating massive AT&T ...

    www.aol.com/thousands-report-national-t-cell...

    Thousands of AT&T customers across the country began reporting outages on the website Down Detector before 4 a.m. ET. The outage continued for multiple hours into the morning. The outage continued ...

  8. AT&T outage: Company says network is fully restored after ...

    www.aol.com/news/thousands-t-customers-report...

    AT&T, the nation’s largest carrier, has more than 240 million subscribers. More than 70,000 outages were reported after 8 a.m. ET, according to Downdetector , a website that detects outages.

  9. Cellular frequencies in the United States - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies_in...

    The B block of spectrum was awarded to a local wireline carrier that provided landline telephone service in the CMA. The A block was awarded to non-wireline carriers. In 1986, the FCC allocated an additional 5 MHz of spectrum for each channel block, raising the total amount of spectrum per block to the current total of 25 MHz. [3]