Google has kept its Google Voice service small on purpose — still invitation-only — but among early adopters, it’s quite popular.
According to a document that Google filed with the FCC, obtained by BusinessWeek, Google Voice has 1.419 million users, of whom 570,000, or 40%, use it every day.
This suggests that while it’s nowhere near the size of Skype, which has 521 million registered users, many users are relying on it as a full-time complement to (or replacement for) their telephone service.
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