1. First of all, register at www.smsglobal.com
2. After Registering you will get 25 free credits that means you can send 25 free SMS from any number to any number. For using it again register another mobile. 25 SMS is the limitation of this trick from one registered number.
3. Now after registering you will receive password on registered mobile number.
4. Now login with that password that you got on mobile.
5. Now go to Send SMS to number .
6. After entering the details as explained. Click on send.
7. That's all the hack. I know its limited but its awesome.