Hi, use free sms sending websites such as smscountry.com to send free sms messages to your friends etc. Most of these websites need you to register to send smss but that's free so there will be no problem. Just make sure that you are registering to a website which allows you to send smss to your own country. For example, there are many websites for the US but for India there are only a few, such as 160by2.com
Just set up and aim account or yahoo messenger and from there you can send texts
You can send free sms from Smsze.com , Smszeallow you to send free sms to any mobile number.