Hey friends today i find BharatStudent is providing their user free voip service all over world. You need to make a account on there site. When you create your account you will get 250 credit points.You need at least 500 points to redeem. To get 250 more point do following

1 Upload a video 50 points (you will get points for 1st video upload)
2 Make a blog 50 points (i am not sure but i think for ane post in 24 hours)
2 Send friend request 50 points (50 point for ur reference)

After earning points redeem them here
Download the software from here

So do fast call your friends for free Hurry UP