CTIA announced that wireless data service revenues for 2006 rose to $15.2 bln. This represents a 77% increase over 2005, when data revenue was $8.6 bln Data revenue represents money that wireless carriers earn on services other than voice. Wireless data revenues now total roughly 13% of all wireless service revenues. Text messaging continues to be enormously popular, with more than 158 bln messages sent in 2006. This represents a 95% increase over 2005.