Roughly 60 percent of Japanese high school students have mobile phones and half of them exchange 10 or more e-mail messages a day using their phones, according to a recent 1999 poll on youth trends by the Management and Coordination Agency.

Conducted in November and December last year in Miyagi, Chiba, Tokyo, Ishikawa, Nara and Kumamoto prefectures, the wide-ranging survey covered 3,100 second-year students, most aged 16 or 17, and their parents or guardians.

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