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mobile telephone summary

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Learn about the history, functions, and characteristics of mobile phone systems

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Below is the article summary. For the full article, see mobile telephone.
AT&T Indiana Headquarters, Indianapolis, Indiana, circa October 2015.
AT&T Corporation Summary
AT&T (T) is a Dallas-based holding company that comprises telecommunications and technology subsidiaries and affiliates; its history dates back to 1876 and Alexander Graham Bell’s invention of the telephone. The company, long referred to as “Ma Bell,” swelled to great corporate heights as it built
A photo of Satya Nadella, Microsoft chairman and CEO, smiling while speaking on stage at the Microsoft Build 2025 conference in Seattle.
Microsoft Corporation Summary
Microsoft Corporation is an American multinational technology company that has been a key player in the computer industry since its founding in 1975. Headquartered in Redmond, Washington, Microsoft initially gained dominance in the operating systems market during the 1980s and ’90s with MS-DOS and