For those that have sprint you can now log in your account....go to "My Sprint and then click "My Online Tools" in the tab right below it. Then click on "Text Messaging in left bottom corner..It highlighted in Blue...Then you will see a box on the left that says "The Online Text Messenger".Sprint has teamed up with ZIPWHIP a third party company to offer texting from your computer to all major carriers.
What is Zipwhip? Zipwhip is a text messaging utility. It allows users to send, receive, and manage text messages online for Free! This is the next best thing to 3jam online texting who recently started charging..... or having to have your phone hooked up to active-sync.....
Read more at
http://sprint.zipwhip.com/ 