Text messages sent to and from mobile phones will more than double over the next five years to 2.3 trillion messages sent by 2010. The number of messages transmitted over short message service (SMS) systems in 2005 was estimated at 936 bln, according to Gartner. Total revenues from text messaging is forecast to grow to $72.5 bln in 2010 from $39.5 bln in 2005.