From a survey of Japanese middle school students:

• Nearly half of Japanese 8th graders own cell phones
• Significantly more girls (58.8 percent) own cell phones than boys (41.1 percent)
• While over 85 percent of cell-phone owners say they have a large or relatively large number of friends who own cell phones, only 62 percent of non cell-phone owners can say the same thing
• When using cell phones to talk, they generally call family members, typically only a few times a week, but when sending text messages, they usually send them to friends nearby
• 54 percent of cell phone owners send more than 10 messages a day

...via Cognitive Daily