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  2. eSIM - Wikipedia

    en.wikipedia.org/wiki/ESIM

    An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.

  3. 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.

  4. Google Fi Wireless - Wikipedia

    en.wikipedia.org/wiki/Google_Fi_Wireless

    Google Fi Wireless (pronounced / f aɪ /), formerly Project Fi and Google Fi, is an American MVNO telecommunications service by Google that provides telephone calls, SMS, and mobile broadband using cellular networks and Wi-Fi. Google Fi uses the T-Mobile network. Google Fi is a service for US residents only, as of late 2023. [1]

  5. Advanced Mobile Location - Wikipedia

    en.wikipedia.org/wiki/Advanced_Mobile_Location

    Advanced Mobile Location (AML) is a free-of-charge emergency location-based service (LBS) available on smartphones that, when a caller dials the local (in country) short dial emergency telephone number, sends the best available geolocation of the caller to a dedicated end-point, usually a Public Safety Answering Point, making the location of the caller available to emergency call takers in ...

  6. AT&T customers hit by widespread cellular outages in the U.S.

    www.aol.com/news/t-verizon-t-mobile-customers...

    The San Francisco Fire Department said on X that it was aware of an issue affecting AT&T wireless customers' making and receiving phone calls, including to 911. “The San Francisco 911 center is ...

  7. Voice over LTE - Wikipedia

    en.wikipedia.org/wiki/Voice_over_LTE

    Furthermore, a 4G/LTE device may say “Emergency Calls Only” within the system settings or notifications area but that message does not prove the device can actually make an Emergency call over 4G/LTE. [14] Additionally a device may be configured for 4G Emergency Calls in a given region but fail to connect when placing a 4G Call in another ...

  8. Operator assistance - Wikipedia

    en.wikipedia.org/wiki/Operator_assistance

    A third number call or third party call is an operator assisted telephone call that can be billed to the party other than the calling and called party. The operator calls the third number for the party to accept the charges before the call can proceed. Time and charges was a service that could be requested of an operator before a call began ...

  9. Enhanced 911 - Wikipedia

    en.wikipedia.org/wiki/Enhanced_911

    Calls made to non-911 emergency numbers (such as the direct line to a police or fire department) might not have automatic location enabled. Calls to 911 are answered by an operator at a PSAP. In addition to the voice transmission, the telephone network also transmits a number associated with the current call, the ANI.

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