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2. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network. While the transmission of speech by signal has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent.

3. 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 ...

4. Rotary dial - Wikipedia

   en.wikipedia.org/wiki/Rotary_dial

   A rotary dial is a component of a telephone or a telephone switchboard that implements a signaling technology in telecommunications known as pulse dialing. It is used when initiating a telephone call to transmit the destination telephone number to a telephone exchange . On the rotary dial, the digits are arranged in a circular layout, with one ...

5. Turn in old cell phone for a free sandwich

   www.aol.com/2009/12/09/for-an-old-cell-phone-get...

   Dec. 11-13, Subway is holding a cell phone recycling campaign in the city in partnership with environmental group Rock the. If you live in Rochester, N.Y., and have an old, dead cell phone, here's ...

6. Motorola bag phone - Wikipedia

   en.wikipedia.org/wiki/Motorola_Bag_Phone

   The Bag Phones are a derivative of the Motorola Tough Talker series of transportable phones, which in turn descended from the DynaTAC car phones introduced in 1984. All of these phones feature a modular design in which the handset attaches to the transceiver , which is then powered by either a vehicle's power system (in the car phones) or a ...

7. Telephone keypad - Wikipedia

   en.wikipedia.org/wiki/Telephone_keypad

   A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...