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  2. List of countries by smartphone penetration - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_smart...

    These numbers come from Newzoo's Global Mobile Market Report 2018. [5] By total number of smartphone users, "China by far has the most, boasting 783 million users. India took the #2 spot with 375 million users (less than half of China’s number). However, that gap will decrease by 2021, when we expect India to have 601 million smartphone users.

  3. List of countries by number of mobile numbers in use

    en.wikipedia.org/wiki/List_of_countries_by...

    List of countries by number of mobile numbers in use. This list ranks the countries of the world by the number of mobile phone numbers in use. IMPORTANT NOTE: This list does NOT provide the "number of mobile phones in use." Nobody knows that data. This is a count of phone numbers by country.

  4. Comparison of mobile phone standards - Wikipedia

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

    In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA.

  5. Cellular frequencies in the United States - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies_in...

    There are 51 MTAs, 493 BTAs and 175 EAs in the United States. The Advanced Wireless Services (AWS) bands, auctioned in the summer of 2006, were for 1,710–1,755 MHz, and 2,110–2,155 MHz. The spectrum was divided into blocks: A blocks were for Cellular Market Areas, based on existing cellular (1G) licenses, and were 2 × 10 MHz.

  6. Mobile phone use in schools - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_use_in_schools

    A phone cage used for keeping students' phones away from them during school hours. The use of mobile phones in schools has become a very controversial topic debated by students, parents, teachers and authorities. People who support the use of mobile phones believe that these phones are useful for safety, allowing children to communicate with ...

  7. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    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 ...

  8. List of wireless network technologies - Wikipedia

    en.wikipedia.org/wiki/List_of_wireless_network...

    2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted; 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages. 2G technologies enable the various mobile phone ...

  9. Mobile phone - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone

    Mobile phone. A mobile phone or cell phone[a] is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). The radio frequency link establishes a connection to the switching systems of a mobile phone operator ...