Free VoIP calls are not free in a strict sense. The customers are charged directly or indirectly. First of all, they need to bear the hardware costs. If not, the membership fees which may be very inexpensive.
Viewed so, it would be more appropriate...
I am a journalist and one of the oldest and passionate members of Instablogs, the leading online media in India. I am a gold Medalist in Economics (Graduation). I hold double Master Degrees in Mass Communication and MBA. I possess five years of media experience. Currently, I am writing articles on various issues concerning Orissa, my home state.