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  2. Cellular frequencies - Wikipedia

    Cellular frequencies are the sets of frequency ranges within the ultra high frequency band that have been assigned for cellular-compatible mobile devices, such as mobile phones, to connect to cellular networks. Most mobile networks worldwide use portions of the radio frequency spectrum, allocated to the mobile service, for the transmission and ...

  3. List of countries by number of Internet users - Wikipedia

    Below is a sortable list of countries by number of Internet users, for 2020. Internet users are defined as persons who accessed the Internet in the last 12 months from any device, including mobile phones. [Note 1] Percentage is the percentage of a country's population that are Internet users. Estimates are derived either from household surveys ...

  4. Mobile phones in prison - Wikipedia

    In most jurisdictions, prison inmates are forbidden from possessing mobile phones due to their ability to communicate with the outside world and other security issues. Mobile phones are one of the most smuggled items into prisons. They provide inmates the ability to make and receive unauthorized phone calls, send email and text messages, use ...

  5. History of mobile phones - Wikipedia

    Enabling technology for mobile phones was first developed in the 1940s but it was not until the mid 1980s that they became widely available. By 2011, it was estimated in Britain that more calls were made using mobile phones than wired devices. [1] The history of mobile phones covers mobile communication devices that connect wirelessly to the ...

  6. Telephone slamming - Wikipedia

    Telephone slamming is an illegal telecommunications practice, in which a subscriber's telephone service is changed without their consent. Slamming became a more visible issue after the deregulation of the telecommunications industry in the mid-1980s, especially after several price wars between the major telecommunications companies.

  7. Samsung Galaxy S series - Wikipedia

    The Samsung Galaxy S5 was announced on 24 February 2014. It improves upon the Galaxy S4 by adding a heart rate monitor, IP67 water resistance, a fingerprint scanner, the ability to record 4K videos (2160p at 30fps) and 1080p at twice the frame rate (60 fps), phase-detection autofocus which is faster than previously used contrast detection, the ability to take better photos in low light levels ...

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