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?
UPDATE3:
At some point, someone removed my Update 2. This puts it back. More importantly as of 10/19/2015 the Terms of Service is still in a state that it should be impossible to legally utilize their services.
Answer
Data24-7 offers an API for looking up the carrier for wireless phone numbers. It also returns the email addresses to send SMS and MMS messages to the phone. It's not free, it's $12 per month and $0.006 per lookup.
The link is: http://www.data24-7.com