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  2. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    SIM lock. A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM ...

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    en.wikipedia.org/wiki/ebay-cell-phones-for-sale...

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  4. Microsoft Lumia 640 - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Lumia_640

    The Microsoft Lumia 640 XL is the larger, "phablet"-type version of the Lumia 640, with a 5.7-inch HD IPS LCD display. The 640 XL is equipped with the same basic hardware and network connectivity specifications as the Lumia 640, but features a Zeiss -engineered 13 MP (1/3.0″ sensor) rear camera with LED flash, as well as a 5MP wide-angle ...

  5. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946, AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Calls were set up manually by an operator and ...

  6. AT&T Wireless Services - Wikipedia

    en.wikipedia.org/wiki/AT&T_Wireless_Services

    AT&T Wireless Services, Inc., formerly part of AT&T Corporation, was a wireless telephone carrier founded in 1987 in the United States, based in Redmond, Washington, and later traded on the New York Stock Exchange under the stock symbol "AWE", as a separate entity from its former parent. On October 26, 2004, AT&T Wireless was acquired by ...

  7. Fire Phone - Wikipedia

    en.wikipedia.org/wiki/Fire_Phone

    Critics praised the Dynamic Perspective, Firefly and, to a lesser extent, the packaged headphones, but derided the build, design, Fire OS version of Android, specifications, and exclusivity to AT&T. Amazon does not release sales figures for any of its devices, but based in part on its quickly declining prices and an announced $170 million write ...

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