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  2. Mobile telephone numbering in India - Wikipedia

    en.wikipedia.org/wiki/Mobile_telephone_numbering...

    In India, mobile numbers (including pagers) on GSM, WCDMA, LTE and NR networks start with either 9, 8, 7 or 6.Each telecom circle is allowed to have multiple private operators; earlier it was two private + BSNL/MTNL, subsequently it changed to three private + BSNL/MTNL in GSM; now each telecom circle has all four operators including Reliance Jio, Bharti Airtel, Vodafone idea ltd and BSNL/MTNL.

  3. List of mobile network operators in Europe - Wikipedia

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

    Austria has 13.0 million assigned numbers (i.e. 2.0 2G, 10.8 3G and 0.1 4G SIM cards), or a 151.0% penetration rate (Q4 2014). [11] The regulatory authority for telecommunication in Austria is the Austrian Regulatory Authority for Broadcasting and Telecommunications (RTR).

  4. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The uniqueness conjecture for Markov numbers [151] that every Markov number is the largest number in exactly one normalized solution to the Markov Diophantine equation. Pillai's conjecture : for any A , B , C {\displaystyle A,B,C} , the equation A x m − B y n = C {\displaystyle Ax^{m}-By^{n}=C} has finitely many solutions when m , n ...

  5. List of best-selling mobile phones - Wikipedia

    en.wikipedia.org/wiki/List_of_best-selling...

    The number sold represents how many units were sold throughout its whole lifetime. The first cell phone was produced by Motorola. Since then there had been produced around 17.37 billion mobile phones as of 2015. [83] The Motorola StarTAC from 1996 was the first phone to be widely popular. The Nokia 3310 from 2000 sold 126 million units.

  6. Number theory - Wikipedia

    en.wikipedia.org/wiki/Number_theory

    Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions. German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics."

  7. List of iPhone models - Wikipedia

    en.wikipedia.org/wiki/List_of_iPhone_models

    The iPhone, developed by Apple Inc., is a line of smartphones that combine a mobile phone, digital camera, personal computer, and music player into one device. Introduced by then-CEO Steve Jobs on January 9, 2007, the iPhone revolutionized the mobile phone industry with its multi-touch interface and lack of physical keyboard.

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