Google Voice is a pretty incredible service, but not everyone understands what exactly it does (hint: it isn't VoIP - yet!). Google is hoping to remedy that with a fantastic series of videos which I've painstakingly pasted below for you to view.
Although, Android phones allow full use of Google Voice services, even people with iPhones through AT&T can take advantage of Google's Voicemail services. And Google Voice has a nice iPhone Web App.
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