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  2. 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 three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS, Boost Mobile, Cricket Wireless, and TracFone brands served about 36 million subscribers.

  3. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN) or large enterprise telecommunications systems. It facilitates the interconnection of telephone subscriber lines or digital system virtual circuits, enabling telephone calls between subscribers.

  4. Linux - Wikipedia

    en.wikipedia.org/wiki/Linux

    It starts processes such as system services and login prompts (whether graphical or in terminal mode). Software libraries, which contain code that can be used by running processes. On Linux systems using ELF-format executable files, the dynamic linker that manages the use of dynamic libraries is known as ld-linux.so.

  5. Cisco - Wikipedia

    en.wikipedia.org/wiki/Cisco

    Cisco Systems was founded in December 1984 by Leonard Bosack and Sandy Lerner, two Stanford University computer scientists who had been instrumental in connecting computers at Stanford. They pioneered the concept of a local area network (LAN) being used to connect distant computers over a multiprotocol router system.

  6. Mobile virtual network enabler - Wikipedia

    en.wikipedia.org/wiki/Mobile_virtual_network_enabler

    Mobile virtual network enabler. A mobile virtual network enabler ( MVNE) is a company that provides network infrastructure and related services, such as business support systems, administration, and operations support systems to a mobile virtual network operator (MVNO). This enables MVNOs to offer services to their own customers with their own ...

  7. List of largest companies in the United States by revenue

    en.wikipedia.org/wiki/List_of_largest_companies...

    The Fortune 500 list of companies includes only publicly traded companies, also including tax inversion companies. There are also corporations having foundation in the United States, such as corporate headquarters, operational headquarters and independent subsidiaries. The list excludes large privately held companies such as Cargill and Koch ...

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