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  2. Wi-Fi calling - Wikipedia

    en.wikipedia.org/wiki/Wi-fi_calling

    Wi-Fi calling, also called VoWiFi, [ 1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [ 2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet, while ...

  3. Comparison of mobile phone standards - Wikipedia

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

    GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM . Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.

  4. AT&T Mobility - Wikipedia

    en.wikipedia.org/wiki/AT&T_Mobility

    AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the second largest wireless carrier in the United States, with 114.5 million subscribers as of March 31, 2024.

  5. Telecommunications device for the deaf - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_device...

    The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf ( TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include teletypewriter ( TTY ...

  6. Mobile phones and driving safety - Wikipedia

    en.wikipedia.org/wiki/Mobile_phones_and_driving...

    Japan prohibits hand-held mobile phone or mobile device use while driving. New Zealand has banned hand held mobile phone use since 1 November 2009. Many states in the United States have banned texting on cell phones while driving. Some states allow for drivers to use a cell phone mount but some states do not.

  7. Walkie-talkie - Wikipedia

    en.wikipedia.org/wiki/Walkie-talkie

    Walkie-talkie. Recreational, toy and amateur radio walkie-talkies. Assorted two-way FRS and GMRS walkie talkies with hand mic. A walkie-talkie, more formally known as a handheld transceiver ( HT ), is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio ...

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