This is really a truth, You can free sms using Yahoo!. Curious!!! Ok, I will give the tricks now. Just follow this step.- Log in to your YM account (I think You have it all)
- Then go to top menu "Action" and choose "Send an SMS Message"
- After You click it, go to "other contact" and fill mobile number do You want.
- After You fill it click ok. Now You just leave text/message then send.
Hmm.. Thats working. Thanks