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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM lock. A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [ 1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM ...

3. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   History of mobile phones. A man talks on his mobile phone while standing near a conventional telephone box, which stands empty. 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 ...

4. 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.

5. List of open-source mobile phones - Wikipedia

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

   Distributions for existing phones. KDE Plasma Mobile running on postmarketOS on the Nexus 5. postmarketOS, Ubports, and KDE Neon are open-source distributions running on existing smartphones originally running Android. Maemo Leste is available for Nokia N900 and Motorola Droid 4.

6. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. A Lenovo smartphone with two SIM card slots. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile ...

7. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/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, which ...