According to CTIA, mobile users sent 18.7 bln text messages in the month of December 2006, up 92% from 9.7 bln messages in December 2005. Text messaging is the preferred channel for many teens and those in the 18 to 24 year-old demographic. More than 70% of young adults (18-24) and close to 60% of teens (13-17) send text messages every month.