Some miscellaneous statistics quoted regarding teens and wireless technology:

24.7% of surveyed youths believe that their parents monitor their activity using technology, 97.9% indicated they would care if their parents monitored their activity using technology.

…

The majority of ring tones were downloaded by subscribers age 13-24, and more than 62 percent of those consumers downloaded more than one ring tone in the previous month (M:Metrics, Inc.)

…some teenagers are spending more money on wireless phones than on CDs and clothing. According to a report, half of all teenagers now own wireless devices and in some high schools 80% of the students have one. Parents usually favor their children having wireless devices to keep them connected and for safety — ABC News

An estimated 76% of kids ages 15 to 19 and 90% of people in their early 20s regularly use their cell phones for text messaging, ring tones and games, and that enthusiasm has turned wireless data services into a significant business. — Time, “How Kids Set The Ring Tone”

Ring tone revenues were $91 mln in 2003, more than doubled to $217 mln in 2004 and will reach $724 mln in 2009. Mobile games revenues were $24 mln in 2003, tripled to $72 mln in 2004, and should reach $430 mln in 2009. — Jupiter Research

More at the site that I quoted these stats from:

YPulse: Leave My Phone Alone!