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  2. Metro by T-Mobile - Wikipedia

    en.wikipedia.org/wiki/Metro_by_T-Mobile

    At the time of the merger, T-Mobile had about 32 million subscribers, to which MetroPCS added around 9 million. [18] In 2012, there was a series of armed robberies in Metro stores which was attributed to low security measures. [19] In the same year, T-Mobile and Metro became some of the earliest companies to offer unlimited data plans. [20]

  3. Call detail record - Wikipedia

    en.wikipedia.org/wiki/Call_detail_record

    A call detail record (CDR) is a data record produced by a telephone exchange or other telecommunications equipment that documents the details of a telephone call or other telecommunications transactions (e.g., text message) that passes through that facility or device. The record contains various attributes of the call, such as time, duration ...

  4. SIM Application Toolkit - Wikipedia

    en.wikipedia.org/wiki/SIM_Application_Toolkit

    SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...

  5. T-Mobile US - Wikipedia

    en.wikipedia.org/wiki/T-Mobile_US

    T-Mobile U.S. traces its roots to the 1994 establishment of VoiceStream Wireless PCS as a subsidiary of Western Wireless Corporation.After its spin off from parent Western Wireless on May 3, 1999, VoiceStream Wireless was purchased by Deutsche Telekom AG in 2001 for $35 billion and renamed T-Mobile USA, Inc., in July 2002.

  6. Smart refrigerator - Wikipedia

    en.wikipedia.org/wiki/Smart_refrigerator

    By the late 1990s and the early 2000s, the idea of connecting home appliances to the Internet (Internet of Things) had been popularized and was seen as the "next big thing" [6]. The proposed idea of a smart fridge that could keep track of its contents with "a bar-code reader within the fridge" had become popular in various technology newspapers ...

  7. List of mobile network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_network...

    Each active SIM card is considered a subscriber. [7] Wholesale customers include users of machine to machine networks and mobile virtual network operators that operate on the host network, but are managed by wholesale partners. Subscriber counts are sourced from each companies quarterly reports.

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