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  2. GSM frequency bands - Wikipedia

    en.wikipedia.org/wiki/GSM_frequency_bands

    A new addition has been the quad-band phone, also known as a World Phone, [5] supporting at least all four major GSM bands, allowing for global use (excluding non-GSM countries such as Japan, South Korea and as well countries where 2G system was shut down to release frequencies and spectrum for LTE networks like Australia (since 2017 ...

  3. Comparison of mobile phone standards - Wikipedia

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

    Unlimited cell size, low transmitter power permits large cells Very low density Soft No EVDO / Yes SVDO [2] 3G: W-CDMA: UMTS (3GSM) Digital: 2001 Worldwide SIM card: None Smaller cells and lower indoors coverage on 2100 MHz; equivalent coverage indoors and superior range to GSM on 850/900 MHz. Very low density Soft Yes [3] 4G: OFDMA: LTE ...

  4. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    GSM utilizes a cellular network, meaning that cell phones connect to it by searching for cells in the immediate vicinity. There are five different cell sizes in a GSM network: macro; micro; pico; femto, and; umbrella cells; The coverage area of each cell varies according to the implementation environment.

  5. Cellular frequencies - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies

    In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area. Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones; with such a ...

  6. Cellular network - Wikipedia

    en.wikipedia.org/wiki/Cellular_network

    The effect of frequency on cell coverage means that different frequencies serve better for different uses. Low frequencies, such as 450 MHz NMT, serve very well for countryside coverage. GSM 900 (900 MHz) is suitable for light urban coverage. GSM 1800 (1.8 GHz) starts to be limited by structural walls.

  7. List of mobile network operators - Wikipedia

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

    This is a list of the world's five largest satellite phone network operators measured by number of subscribers. ... Proprietary FDMA/GSM: 0.260 (December 2007) [38 ...

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