People who do this are very annoying(aka CHEAP!). Mainly because most VoIP calls have low quality and have static issues. When you call me and I can't see the number of the person who's calling, that's annoying. It's also annoying if you break up or I can hear a time delayed echo of everything I just said and then have to wait for you to hear it. When this happens I don't want to talk to you as it's a painful experience. If you can't afford $20/month for a voice plan then perhaps you should just have a tablet and stick to e-mail?