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As with any free service, you need to look at free VOIP services with some skepticism. The service may be free, but what about software, equipment, voice quality, etc.? The one free service that stands up well to this skepticism is Skype. Skype is free -- to anyone else who also uses Skype. It requires only a simple software download and no special hardware. And the voice quality, while uneven, certainly works well enough. It has limitations, of course -- you need to have your computer on to make and receive calls. And there's no 911 or number portability. Still, the cost is right and the service works, as advertised.