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  2. Cellphone surveillance - Wikipedia

    en.wikipedia.org/wiki/Cellphone_surveillance

    Cellphone surveillance. Diagram showing the operation of a StingRay device for cellphone surveillance. Cellphone surveillance (also known as cellphone spying) may involve tracking, bugging, monitoring, eavesdropping, and recording conversations and text messages on mobile phones. [1] It also encompasses the monitoring of people's movements ...

  3. Cell site - Wikipedia

    en.wikipedia.org/wiki/Cell_site

    A cell site, cell phone tower, cell base tower, or cellular base stationis a cellular-enabled mobile devicesite where antennasand electronic communications equipment are placed (typically on a radio mast, tower, or other raised structure) to create a cell, or adjacent cells, in a cellular network. The raised structure typically supports antenna ...

  4. UMTS - Wikipedia

    en.wikipedia.org/wiki/UMTS

    The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.

  5. Nextel - Wikipedia

    en.wikipedia.org/wiki/NEXTEL

    Nextel. Nextel Communications, Inc. was an American wireless service operator that merged with and ceased to exist as a subsidiary of Sprint Corporation, which would later be bought by T-Mobile US and folded into that company. Nextel in Brazil, and formerly in Argentina, Chile, Peru, the Philippines, and Mexico, [3] is part of NII Holdings, a ...

  6. Cellular network - Wikipedia

    en.wikipedia.org/wiki/Cellular_network

    v. t. e. A cellular network or mobile network is a telecommunications network where the link to and from end nodes is wireless and the network is distributed over land areas called cells, each served by at least one fixed-location transceiver (typically three cell sites or base transceiver stations ). These base stations provide the cell with ...

  7. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    Website. www .gsma .com. The Global System for Mobile Communications ( GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such as mobile phones and tablets. GSM is also a trade mark owned by the GSM ...

  8. List of computer system manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_computer_system...

    Sold computer division to AST Research; former parent company of Radio Shack: Tangerine Computer Systems — United Kingdom: 1979: 1987: Bankruptcy: Télémécanique — France: 1968: 1976: Computer division merged with CII's minicomputer division to become Société européenne de mini-informatique et systèmes (SEMS) Tava Corporation ...

  9. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network. While the transmission of speech by signal has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent.

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