SAN FRANCISCO—At the MacWorld ShowStoppers event Monday night, I got a quick look at Newber, an iPhone app from Freedom Voice Systems that lets you redirect calls made to a new number you give out (“newber,” get it?) to alternate numbers depending on your location. If you’re in the office at your desk, the app can send calls to your work phone. At home? It rings the house phone. Neither? The call will ring on your iPhone. (See also: Grand Central.) The app uses GPS to suggest call routing, but ultimately you make the routing decision. Sounds like a cool idea, but if you want to try it, you can’t.

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