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2. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   The system re-used six frequencies in the 450 MHz band in nine sites. [16] In the UK, Channel Islands and elsewhere the "Rabbit" phone system was briefly used, being a hybrid of "cell" base stations and handsets. One major limitation was that you had to be less than 300 feet (91 m) feet (closer with buildings) from a base due to power ...

3. Smartphone - Wikipedia

   en.wikipedia.org/wiki/Smartphone

   A mobile operating system (or mobile OS) is an operating system for phones, tablets, smartwatches, or other mobile devices. Globally, Android and IOS are the two most used mobile operating systems based on usage share, with the former having been the best selling OS globally on all devices since 2013.

4. 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.

5. Mobile operating system - Wikipedia

   en.wikipedia.org/wiki/Mobile_operating_system

   A mobile operating system is an operating system used for smartphones, tablets, smartwatches, smartglasses, or other non-laptop personal mobile computing devices.While computers such as typical/mobile laptops are "mobile", the operating systems used on them are usually not considered mobile, as they were originally designed for desktop computers that historically did not have or need specific ...

6. Best Ways to Sell Your Phone for the Most Money - AOL

   www.aol.com/best-ways-sell-phone-most-160043610.html

   Some of the biggest are: Apple trade-in program. Samsung trade-in program. Amazon trade-in program. Best Buy trade-in program. Walmart trade-in program. This is the simplest option to get value ...

7. Model 500 telephone - Wikipedia

   en.wikipedia.org/wiki/Model_500_telephone

   The Western Electric model 500 telephone series was the standard domestic desk telephone set issued by the Bell System in North America from 1950 through the 1984 Bell System divestiture. The successor to the model 302 telephone, the model 500's modular construction compared to previous types simplified manufacture and repair and facilitated a ...