Gizmo5 works with Google Voice, offers cheap computer calling to anywhere with no per call connection fee. Go to the Gizmo5 website and you’ll be welcomed with the greeting, "Gizmo5 has Been Acquired by Google. New user signup has been suspended and will return when we re-launch." Current Gizmo5 members can continue to use the services.
Speculation is running a little wild at the moment, but the general sense is that Google may soon be giving traditional phone companies a run for their money. Gizmo5 already allows one number to be integrated with home, cell, and Gizmo5 computer calling and offers a number of other highly attractive features.
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