I use Rebtel. Join Rebtel  and get 10 free international minutes. You dont have to pay for it.After you buy an account  of $10 they will add extra $10 into your account. No pin at all, no 011 dial,  just a direct dial to your home. No connection fee also. Charge per minutes.

I like it the best after a long research and experience.  Click Here to join Rebtel  to get extra 20 minutes referrial bonus on international call. And thats free. You just need to sign up but dont need to buy any credits to get the free call. But join from the above link.

So in Total you will get 30  Free Minutes for any international Call  without buying any credits. Just sign up with above/below link .

Good Luck