Voice Off Features like call routing, screening and voice-to-text functionality--and the lack of a price tag--give Google Voice strong appeal to more than 1 million users. Others can't get over the quirks. Sometimes you get what you pay for.

Can't Live With It
William Wnekowicz, founder of Altum Design Studios, a web design firm in Cedar Grove, N.J.

Altum Design Studios would seem to be an ideal Google Voice user. The upstart web design firm specializing in business-to-business marketing has only two-and-a-half staffers, including founder William Wnekowicz. The firm's high-end and often demanding clients need to be able to reach Wnekowicz and his employees.

Although Wnekowicz loves the idea of Google Voice--he dreams of the simplicity of call routing and screening depending on his team's schedule--there's one big problem with the service: It won't allow him to port his existing cell phone number to the service.