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  2. Mobile Telephone Switching Office - Wikipedia

    en.wikipedia.org/wiki/Mobile_Telephone_Switching...

    When the MSC gets the call, it checks its database for the location of the phone. Then it picks a frequency pair the phone will use in that cell to take the call. The MSC communicates with the phone over the control channel to tell it which frequencies to use, and once the phone and the tower switch on those frequencies, the call is connected.

  3. No. 4 Electronic Switching System - Wikipedia

    en.wikipedia.org/wiki/No._4_Electronic_Switching...

    AT&T Long Distance was the primary customer for the switch. Driving development from the customer's perspective was AT&T VP Billy Oliver. [4] Previous tandem switching systems, primarily the No. 4 Crossbar switch, used analog voice signaling. The decision to switch in a digital voice format was controversial at the time, both from a technical ...

  4. 5ESS Switching System - Wikipedia

    en.wikipedia.org/wiki/5ESS_Switching_System

    The 5ESS switch has three main types of modules: the Administrative Module (AM) contains the central computers; the Communications Module (CM) is the central time-divided switch of the system; and the Switching Module (SM) makes up the majority of the equipment in most exchanges. The SM performs multiplexing, analog and digital coding, and ...

  5. One in Four iPhone Users Would Dump AT&T for Verizon ... - AOL

    www.aol.com/2010/09/21/iphone-users-verizon-att...

    Almost one in four users of Apple's (AAPL) iPhone would switch to Verizon Communications (VZ) from AT&T (T) as their cell phone carrier once AT&T's exclusive agreement with the iPhone expires ...

  6. AT&T Continues to See Subscriber Momentum, but Is It ... - AOL

    www.aol.com/t-continues-see-subscriber-momentum...

    AT&T's stock has greatly outperformed rival Verizon this year. AT&T's stock has greatly outperformed rival Verizon this year.

  7. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  8. Better Passive Income Stock: Verizon vs. AT&T - AOL

    www.aol.com/better-passive-income-stock-verizon...

    Which is the better passive income stock right now? Add to that the hefty $2.71 annual dividend -- representing a yield of roughly 6.8% -- and investors in Verizon banked a total return of nearly 13%.

  9. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    Most email software and applications have an account settings menu where you'll need to update the IMAP or POP3 settings. When entering your account info, make sure you use your full email address, including @aol.com, and that the SSL encryption is enabled for incoming and outgoing mail.

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