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2. History of the telephone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_telephone

   Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...

3. How and where to buy refurbished tech online - Engadget

   www.engadget.com/where-to-buy-refurbished-tech...

   That said, a refurbished Galaxy phone can sell for as much as 30 percent off the standard price. The phones come with a new battery, are tested and repaired with Samsung parts and get new ...

4. List of open-source mobile phones - Wikipedia

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

   This presents security concerns; baseband attacks can read and alter data on the phone remotely. The Librem 5 mobile segregates the modem from the system and memory, making it a separate module, a configuration rare in modern cellphones. There is an open-source baseband project, OsmocomBB. Operating system: middleware and user interface

5. Where to sell your used and unwanted gadgets

   www.engadget.com/where-to-sell-used-electronics.html

   With over 1,900 locations across the US, it’s easy enough to bring your unwanted phones, tablets, game consoles, smart speakers and video games to a nearby Target’s electronics department for ...

6. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS, Boost Mobile, Cricket Wireless, and Tracfone brands served about 36 million subscribers.

7. The best places to buy and sell a used iPhone - Engadget

   www.engadget.com/2016-09-10-the-best-places-to...

   Verizon offered us the best quote on an iPhone 6, with a $265 trade-in value. AT&T quoted us a price of $200 for a 16GB iPhone 6, while T-Mobile and Sprint offered $191 and $159, respectively ...