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  2. AT&T - Wikipedia

    AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile telephone services in the U.S. As of 2022, AT&T was ranked 13th on the Fortune 500 rankings of the largest United States corporations, with revenues of $168.8 ...

  3. Smartphone - Wikipedia

    A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, which facilitate wider software, internet (including web browsing over mobile broadband), and multimedia functionality (including music, video, cameras, and ...

  4. IBM - Wikipedia

    IBM was founded in 1911 in Endicott, New York, as the Computing-Tabulating-Recording Company (CTR) and was renamed "International Business Machines" in 1924. IBM is incorporated in New York and has operations in over 170 countries.

  5. USAA - Wikipedia

    USAA is a pioneer of the concept of direct marketing; most of its business is conducted over the Internet or telephone using employees instead of agents. Until the 1960s, the bulk of its business was conducted via mail. In the late 1960s, USAA began a transition from mail to phone-based sales and service.

  6. List of LTE networks - Wikipedia

    Apart from their main spectrum holdings across large regions in the country (listed below) the major US carriers (AT&T, Sprint, T-Mobile & Verizon) also hold various Cellular Market Area (CMA) and/or Economic Area (EA) licenses for the AWS 1700 band, as well as Major Trading Area (MTA) and/or Basic Trading Area (BTA) licenses for the PCS 1900 band.

  7. KT Corporation - Wikipedia

    Ever since KT introduced the Apple iPhone to South Korea, it has been constantly seeking new business area, such as media, e-commerce, and global business partnerships. The company has a well-distributed shareholder structure under which the National Pension Service (NPS) is the largest shareholder (6.81% as of December 31, 2012), but NPS holds ...

  8. LTE (telecommunication) - Wikipedia

    For the complete list of all the countries/territories, see list of countries by 4G LTE penetration.. LTE-TDD and LTE-FDD. Long-Term Evolution Time-Division Duplex (LTE-TDD), also referred to as TDD LTE, is a 4G telecommunications technology and standard co-developed by an international coalition of companies, including China Mobile, Datang Telecom, Huawei, ZTE, Nokia Solutions and Networks ...

  9. History of the iPhone - Wikipedia

    Genesis of iPhone. It was coming from Jean Marie Hullot, software engineer from NextStep then Macos, the idea of an Apple phone. After years he convinced Steve Jobs doing so. A first team was created in Paris, few years later he took the project more seriously : the french engineers were asked to work back in the US, Hollot declined and resigned from Apple with his team.