I don't know why this was downvoted, because absolutely this is why I started to use WhatsApp. Though the main problem is very high international SMS/call charg

I don't know why this was downvoted, because absolutely this is why I started to use WhatsApp. Though the main problem is very high international SMS/call charges. I was in an international distance relationship a couple of years ago, and doing anything over cellular would have bankrupted me.