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  2. AT&T mobile services interrupted for customers. What to know ...

    www.aol.com/t-mobile-services-interrupted...

    AT&T mobile users began experiencing "SOS" only functionality beginning around 3:30 a.m. as nearly 80,000 cell phone users now experience outage. AT&T mobile services interrupted for customers ...

  3. Attempted acquisition of T-Mobile USA by AT&T - Wikipedia

    en.wikipedia.org/wiki/Attempted_acquisition_of_T...

    AT&T, T-Mobile, and Deutsche Telekom was a lawsuit brought by the US Antitrust Division of the Department of Justice seeking to block the merger of AT&T Mobility and T-Mobile USA. [11] Had the purchase been completed, AT&T would have had a customer base of approximately 130 million users, making AT&T the largest wireless carrier in the United ...

  4. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    Call blocking, also known as call block, call screening, or call rejection, allows a telephone subscriber to block incoming calls from specific telephone numbers. This feature may require an additional payment to the subscriber's telephone company or a third-party. Call blocking is desired by individuals who wish to block unwanted phone calls.

  5. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.

  6. Things Boomers Took for Granted That are Obsolete Now

    www.aol.com/things-boomers-took-granted-obsolete...

    The 3G wireless network that introduced so many people to internet on their phones has been completely shut down in the U.S. Cellular providers only have a finite amount of radio frequencies ...

  7. End of 3G service: AT&T will shut down its 3G network ... - AOL

    www.aol.com/news/end-3g-t-shut-down-180841521.html

    AT&T will shut down its 3G wireless network Tuesday, the first step toward the end of 3G service. How will this affect you? ... For premium support please call: 800-290-4726 more ways to reach us ...

  8. Dropped-call rate - Wikipedia

    en.wikipedia.org/wiki/Dropped-call_rate

    In telecommunications, the dropped-call rate (DCR) is the fraction of the telephone calls which, due to technical reasons, were cut off before the speaking parties had finished their conversational tone and before one of them had hung up (dropped calls). This fraction is usually measured as a percentage of all calls.

  9. 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.