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  2. 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 – this ...

  3. T9 (predictive text) - Wikipedia

    en.wikipedia.org/wiki/T9_(predictive_text)

    T9 (predictive text) Logo of T9. T9 is a predictive text technology for mobile phones (specifically those that contain a 3×4 numeric keypad), originally developed by Tegic Communications, now part of Nuance Communications. T9 stands for Text on 9 keys.[1] T9 was used on phones from Verizon, NEC, Nokia, Samsung Electronics, Siemens, Sony Mobile ...

  4. Nokia 6800 series - Wikipedia

    en.wikipedia.org/wiki/Nokia_6800_series

    Nokia 6800 series. The Nokia 6800 series are a selection of Nokia Series 40 phones with an unusual fold-out QWERTY keyboard. This type of keyboard is also used in the more recent Nokia Series 60 Symbian -based Nokia E70. These phones were marketed as "messaging devices": all had built-in email clients, and some had BlackBerry support.

  5. List of BlackBerry products - Wikipedia

    en.wikipedia.org/wiki/List_of_BlackBerry_products

    UMTS 2100/1900/850/800 MHz or 2100/1700/900 MHz and GSM/GPRS/EDGE 850/900/1800/1900. Optical Trackpad, Capacitive Touchscreen interface, 5 MP camera, speakerphone, Bluetooth 2.1, Wi-Fi 802.11 a/b/g/n, GPS, external microSDHC, 3.5 mm stereo audio jack, 1.2 GHz processor, Thinnest BlackBerry, NFC Mobile Payment System.

  6. Form factor (mobile phones) - Wikipedia

    en.wikipedia.org/wiki/Form_factor_(mobile_phones)

    Bar-type smartphones commonly have the screen and keypad on a single face. Sony had a well-known 'Mars Bar' phone model CM-H333 in 1993 that was longer and thinner than the typical bar phone. [2] Bar phones without a full keyboard tend to have a 3×4 numerical keypad; text is often generated on such systems using the Text on 9 keys algorithm.

  7. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    A keyboard layout is any specific physical, visual, or functional arrangement of the keys, legends, or key-meaning associations (respectively) of a computer keyboard, mobile phone, or other computer-controlled typographic keyboard. Physical layout is the actual positioning of keys on a keyboard. Visual layout is the arrangement of the legends ...

  8. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    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 ...

  9. Computer keyboard - Wikipedia

    en.wikipedia.org/wiki/Computer_keyboard

    Typing on a laptop keyboard. A computer keyboard is a peripheral input device modeled after the typewriter keyboard [1][2] which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Replacing early punched cards and paper tape technology, interaction via teleprinter -style keyboards have been the main input ...

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