First u have to buy the student pack sim..
Then u have to message to ur friends till the free SmS finishes..
After finishes.. Call customer care and complaint that your free message as been deducted the money..
But they will say that your money is not deducted..
You have to go on complainting..
They will take the action to solve the problem..
Here the real tricks work..
Tricks for u
Now send unlimited sms for anybody with 5ps/sms charge.. Enjoy.!!!