>>I have a request to allow a user to enter a cell phone number for sending a sms message. I can make it all work except I can't find a way to figure out who the cell phone carrier is so I can complete the address. Anyone know how to do this?
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>Users can move the same number between different carriers, so it would be difficult.
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>Is it possible to just add a field for the users to choose a carrier?

But Skype does it, somehow. Are they storing the carriers' dialing ranges, or what? That'd be one very large table. I wonder how do they do it, and if it's a table, how do (did) they fill it.