Automatically Determine SMS Carrier-Provided Email from Mobile Number

Question

Is there away to automatically determine the SMS carrier email domain from a mobile number?

(Similar to how you can look up a hostname from an IP address?)

Answer 1

Technically, it appears to be possible, considering these guys are doing it. Not sure how, though. Also, Verizon offers a service to check their own network: Verizon Wireless Network Checker

Answer 2

I would suggest NeuStar or use a Aggregator like OpenMarket

Answer 3

Just discovered that you can send SMS for free via google voice! Tested working for about a dozen countries so far (USA, Canada, Taiwan, Japan, Australia, China, France, Germany, Switzerland, UK) - likely others.

This would eliminate the need to use carrier-email checking to reduce spendings on third party SMS gateways.