API to determine cell carrier?

Posted by Chris Lively on Stack Overflow See other posts from Stack Overflow or by Chris Lively
Published on 2008-11-26T22:50:04Z Indexed on 2010/04/10 3:53 UTC
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Is there a free API or some other way to determine what carrier a cell phone number is registered with?

I'd like my application to broadcast text messages without them picking their carrier from a list.

UPDATE: Interestingly, a coworker found the answer: http://developer.whitepages.com/

UPDATE2: Well the whitepages license agreement is so restrictive that you can't build an app for it. Any other ideas?

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