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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. 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.

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. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   The Global System for Mobile Communications ( GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such as mobile phones and tablets. GSM is also a trade mark owned by the GSM Association. [ 2]

6. Treo 650 - Wikipedia

   en.wikipedia.org/wiki/Treo_650

   Unlocked GSM 1.20 was released Mar 2006. The latest (and last) GSM firmware revision is 01.71 (released 2006), with 01.31 released late 2005. Treo 650 users are encouraged to deploy the latest version of the Treo 650 firmware available for their radio type (GSM or CDMA2000) and carrier branding.

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 ...