Yahoo! Messenger - Free SMS!

You can send SMS free of charge to your friend’s mobile phone from anywhere in the world through your computer having Yahoo! Messenger – latest version. [Or you can send this SMS to your friend living in your country itself]. For that your friend’s country should be in the Yahoo! Messenger’s authorized countries list (15 countries). You can also check for making sure the presence of your friend’s mobile phone operator’s name in that list.
Click the Text button in Messenger page of Yahoo! Messenger. In the Text Message page enter your friend’s mobile phone number. Then enter your message in the text box below and click Send button. That’s all. Your friend will have now received an alert message from Yahoo! Messenger about the message to be delivered, followed by your message itself as an SMS on his/her phone! [But note that your friend shall have to part with an SMS’ cost [  in India ] if he/she replies back in response to your message!).