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Google "international premium rate number" and you can get one in any country for free. Up to $0.7 a minute on some satellite and Albanian numbers if you opt for net 30/45 day payment in some places! This stuff happens everyday - I'm surprised no one has talked about it here till now. It is a very difficult problem to address if you want to accept international users and limit false positives.

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I remember reading an article where a guy in the UK set one of these up with a bot like Lenny to make money off the scam calls. It was kind of shocking to me you could just setup any number like that, not just 900 numbers.