How to call pakistan from america for free?

I live in america. I have a no contract iPhone and i text my loved ones with textfree/pinger. I want a way to call them without them having to call me but unfortunately i don't have a contract. Is there a way i can still call them? I've tried so many apps. And don't tell me to get a contract or something, I have another phone but my parents would get suspicious if they saw long distance calls to there and wonder who i was talking to.

Just get Facebook, it would b easier and cause you less grief.