Mobile devices such as mobile phone, PDA, music player and game player are becoming to play an important role in today's communication, education and entertainment. Text typing with these small mobile devices is a challenging research topic for daily work such as emailing, word processing, browsing or searching information, note taking and adding a new contact address into a phone book and so on. In this paper, we propose a new text input interface for Khmer (language of Cambodia) for mobile devices using clickwheel like Apple iPod. We used our proposed Positional Prediction (PP) text input concept for predicting possible combinations of a consonant and vowels or a syllable, and named the new text input interface PP_Clickwheel (Positional Prediction with Clickwheel). We held user study for PP_Clickwheel with ten native participants in Phnom Penh city, Cambodia to judge its user-friendliness based on first-time users' typing speed. The results are acceptable and positive for the current version of PP_Clickwheel prototype.

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