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  2. Mobile phone signal - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_signal

    Mobile phone signal. A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by a mobile phone from a cellular network (on the downlink ). Depending on various factors, such as proximity to a tower, any obstructions such as buildings or trees, etc. this signal strength will vary.

  3. T-Mobile US - Wikipedia

    en.wikipedia.org/wiki/T-Mobile_US

    T-Mobile US. T-Mobile US, Inc., often shortened as T-Mobile, is an American wireless network operator headquartered in Bellevue, Washington, U.S. [6] Its largest shareholder is multinational telecommunications company Deutsche Telekom AG, a German company headquartered in Bonn, Germany.

  4. Transmission medium - Wikipedia

    en.wikipedia.org/wiki/Transmission_medium

    A transmission medium is a system or substance that can mediate the propagation of signals for the purposes of telecommunication. Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the ...

  5. US FCC approves T-Mobile deal to buy budget provider ... - AOL

    www.aol.com/news/us-fcc-approves-t-mobile...

    WASHINGTON (Reuters) -The U.S. Federal Communications Commission said on Thursday it will approve the T-Mobile US deal to buy Ka'ena Corp, the owner of budget service provider Mint Mobile, for up ...

  6. Emergency Alert System - Wikipedia

    en.wikipedia.org/wiki/Emergency_Alert_System

    Emergency Broadcast System, Local Access Alert. The Emergency Alert System ( EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and both AM, FM and satellite radio.

  7. The issue appeared to begin just after 2pm, with both mobile networks going down simultaneously. Customers took to Twitter and other social media platforms to complain about the problems. Anthony ...

  8. Comparison of mobile phone standards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mobile_phone...

    Comparison of mobile phone standards. Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones. A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.

  9. Communication during the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Communication_during_the...

    Following the attacks, the issues with the cell network weren't resolved until 36 cellular COWs (cell towers on wheels) were deployed by September 14, 2001, in Lower Manhattan to support the U.S. Federal Emergency Management Agency (FEMA) and provide critical phone service to rescue and recovery workers.