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  2. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...

  3. Samsung SGH-A877 - Wikipedia

    en.wikipedia.org/wiki/Samsung_SGH-A877

    The Samsung Impression SGH-A877 takes on a slider form; featuring a 3.2-inch AMOLED touch screen (240x400 pixels) capable of 256k (256,000) colors. The front of the phone contains the brilliant touch screen, and three bottom buttons; an incoming call accept button, an incoming call reject/hang up button (which doubles as the power button), and ...

  4. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    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 – this replaced rotary dialing , that had been developed for ...

  5. Portal:Telephones/Selected audio - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones/Selected...

    A dial tone (dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed digit is recognized.

  6. Portal:Telephones - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones

    The Samsung Galaxy Z series are foldable smartphones. A mobile phone, or cell phone, is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones (landline phones).

  7. Samsung SGH-D900 - Wikipedia

    en.wikipedia.org/wiki/Samsung_SGH-D900

    The Samsung SGH-D900, also known as the Ultra Edition 12.9 or Black Carbon, is a slider-style mobile phone created by Samsung Electronics that was announced in Q3 2006 [1] as part of the Samsung Ultra Edition line. It is marketed as the world's thinnest slider phone. Since the end of 2006, a Wine Red edition was added and 2007 marked the ...

  8. Samsung SGH-T729 Blast - Wikipedia

    en.wikipedia.org/wiki/Samsung_SGH-T729_Blast

    Download or store the mobile phone's contact list to my.tmobile.com for later use. As an alternative, the Samsung PC Studio [permanent dead link ‍] can be used software to synchronize contacts and other data, transfer files, or use your phone as a modem (if the user has T-Mobile's internet plan).

  9. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23. [ 2 ]