ko2smsapplet is a frontend to the o2sms perl script by mackers (www.mackers.com):

"o2sms is a grand script to send SMS's (or text messages) via the UNIX command line. Despite its name, it supports Vodafone (Ireland) and Meteor as well as o2 (Ireland) users."

ko2smsapplet supplies a quick and easy way to use this script for KDE users.