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How can I confirm the Mobile Numbers of my users in order to reduce the number of scammers claiming to be in the US but who are actually in another country?

A free solution would be preferred. I use PHP/MySQL.

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up vote 1 down vote accepted

You can send them a text message with a unique code and have them enter it into your website. No special software needed.

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Thanks, but how would I send them a text message? Preferably for free? –  ProgrammerGirl Apr 10 '12 at 15:28
Check out this question and answers –  John Conde Apr 10 '12 at 15:38

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