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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. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  6. Samsung Galaxy (2009 smartphone) - Wikipedia

    en.wikipedia.org/wiki/Samsung_Galaxy_(2009_smart...

    The Samsung GT-I7500 Galaxy is a smartphone manufactured by Samsung that uses the open source Android operating system.It was announced on 27 April 2009 [2] and was released on 29 June 2009 as the first Samsung Mobile device to use the Android operating system introduced in the HTC Dream (marketed as the T-Mobile G1), [3] and the first in what would become the long-running Galaxy series.

  7. mobi (company) - Wikipedia

    en.wikipedia.org/wiki/Mobi_(company)

    mobi acquired wireless spectrum in the PCS band in 2004 [11] and launched service [12] covering Hawaiʻi in 2005. Doing business as mobiPCS, the company and MetroPCS were both backed by venture capital firm M/C Partners, with each disrupting the market in their respective regions by offering no contract, no credit check, unlimited wireless service before those became widespread options in the ...

  8. Charging data record - Wikipedia

    en.wikipedia.org/wiki/Charging_Data_Record

    For mobile telecommunications, the Charging Data Record (CDR) is, in 3GPP parlance, a formatted collection of information about a chargeable telecommunication event (making a phone call, using the Internet from your mobile device).

  9. SIM box - Wikipedia

    en.wikipedia.org/wiki/Sim_box

    A SIM box (also called a SIM bank) is device used as part of a VoIP gateway installation. It contains a number of SIM cards, which are linked to the gateway but housed and stored separately from it. A SIM box can have SIM cards of different mobile operators installed, permitting it to operate with several GSM gateways located in different places.