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  2. 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 ...

  3. E.161 - Wikipedia

    en.wikipedia.org/wiki/E.161

    E.161 is an ITU-T Recommendation that defines the arrangement of digits, letters, and symbols on telephone keypads and rotary dials. It also defines the recommended mapping between the basic Latin alphabet and digits (e.g., "DEF" on 3). [1] Uses for this mapping include: Multi-tap and predictive text systems. Forming phonewords from telephone ...

  4. Keypad - Wikipedia

    en.wikipedia.org/wiki/Keypad

    A telephone keypad using the ITU E.161 standard. Numeric keypad, integrated with a computer keyboard A calculator 1984 flier for projected capacitance keypad. A keypad is a block or pad of buttons set with an arrangement of digits, symbols, or alphabetical letters.

  5. T9 (predictive text) - Wikipedia

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

    Keypad used by T9. T9's objective is to make it easier to enter text messages.It allows words to be formed by a single keypress for each letter, which is an improvement over the multi-tap approach used in conventional mobile phone text entry at the time, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses.

  6. Phoneword - Wikipedia

    en.wikipedia.org/wiki/Phoneword

    Many telephone keypads have letters with the numbers, from which words can be formed. Sign in Argentina giving the number 0800 555 8736 as 0800 555 TREN. Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. [1] In many countries, the digits on the telephone keypad also have letters

  7. File:Telephone-keypad.svg - Wikipedia

    en.wikipedia.org/wiki/File:Telephone-keypad.svg

    Diagram of a telephone keypad with letters according to ISO/IEC 9995-8. Items portrayed in this file ... Description=ISO 9995-8 telephone keypad diagram. ...

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    mail.aol.com

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  9. Multi-tap - Wikipedia

    en.wikipedia.org/wiki/Multi-tap

    Pausing for a set period of time will automatically choose the current letter in the cycle, as will pressing a different key. It is commonly used in conjunction with text-messaging services. Some portable telecommunications devices (such as the BlackBerry ) have bypassed the need for this by incorporating a mini-keyboard for users to type on.