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  2. 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.

  3. Comparison of wireless data standards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_wireless...

    Typical 2G standards include GSM and IS-95 with extensions via GPRS, EDGE and 1xRTT, providing Internet access to users of originally voice centric 2G networks. Both EDGE and 1xRTT are 3G standards, as defined by the ITU, but are usually marketed as 2.9G due to their comparatively low speeds and high delays when compared to true 3G technologies.

  4. 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 ...

  5. List of open-source mobile phones - Wikipedia

    en.wikipedia.org/wiki/List_of_open-source_mobile...

    KDE Plasma Mobilerunning on postmarketOS on the Nexus 5. postmarketOS, Ubports, and KDE Neonare open-source distributions running on existing smartphones originally running Android. Maemo Lesteis available for Nokia N900 and Motorola Droid 4.

  6. iPhone SE (2nd generation) - Wikipedia

    en.wikipedia.org/wiki/IPhone_SE_(2nd_generation)

    It was released with a starting price of US$399, and positioned as a budget phone. [ 13 ] [ 14 ] Following the pattern of the first iPhone SE (which shares the form factor of the iPhone 5s , with the internal hardware of the iPhone 6s ), the second-generation model shares the form factor of the iPhone 8, with internal components from the iPhone ...

  7. Samsung Galaxy - Wikipedia

    en.wikipedia.org/wiki/Samsung_Galaxy

    Logo used until 2015. Samsung Galaxy (Korean: 삼성 갤럭시; stylized as SΛMSUNG Galaxy since 2015 (except Japan where it omits the Samsung branding), [2] previously stylized as Samsung GALAXY; abbreviated as SG) is a series of computing and Android mobile computing devices that are designed, manufactured and marketed by Samsung Electronics since 29 June 2009.

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