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  • Due to the SMS messaging phenomenon noted earlier and to the difficulties in entering text on a mobile phone keypad, substantial research has emerged in recent years on alternative text entry techniques with reduced-key keyboards. Some examples are given in Figure 5-3.

    The experiment was conducted on computer systems running Mandrake's version 7.2. Output was viewed on a 19" colour monitor. Text entry was performed using a PC Concepts numeric keypad with standard 19 mm keys re-labeled to match the letter and number assignments typical of mobile phone keypads (see Figure 4). Participants pressed keys using a technique of their choosing, typically using the index finger of the right (preferred) hand. The keypad was either held in their left hand or positioned on the desk, as desired by each participant.

  • The 12-key keypad consists of number keys 0-9 and two additional keys (* and #). Characters A-Z are spread over keys 2-9 in alphabetic order. The placement of characters is similar on most mobile phones, as it is based on an international standard. The SPACE character is typically assigned to the 0 key, or sometimes to the # key. Since there are fewer keys than the 26 needed for the letters A-Z, three or four letters are grouped on each key, and, so, ambiguity arises. As noted above, text entry using a mobile phone keypad is possible using non-predictive or predictive methods. With a multi-tap, or non-predictive method, the user disambiguates the meaning of the entry through multiple keystrokes.

    With about one billion SMS messages sent per day, today's mobile phone keypad (see Figure 5-2) is one of the world's most common devices for text entry.

    Date/TimeThumbnailDimensionsUserComment
    current22:25, 12 May 20102,214 × 2,585 (1.24 MB)Yoshi Canopus (talk | contribs){{Information |Description=Japanese mobile phone keyboard |Source=My own photo |Date=2010.02.25. |Author=Yoshi Canopus |Permission= |other_versions= }} Category:Mobile phone

  • N97 TV mobile phone QWERTY keyboard.

    In this section, we discuss completion with the mobile phone keypad (summarized in the seventh row in Table 5-1, labeled Phone), where the entry method is one-key with disambiguation with completion. The same discussion applies to entry methods on other keypads with completion, either multi-tap or one-key with disambiguation. As mentioned, a commercial version of such an entry system is manufactured by ZI Corporation. Many entry systems for Japanese and Chinese also use this entry method.

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Soukoreff and MacKenzie [12] developed a model that combines Fitts' law and digram probabilities in a language to predict asymptotic text entry rates for tapping on a soft keyboard with a stylus. Silfverberg et al. [11] extended the model to finger input on a mobile phone keypad using various techniques. Table 2 reproduces Silverberg et al.'s figures and adds an additional entry for .