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					Originally Posted by EddyTheDog  What do they do with the recording? - How can just the word yes pass any security check?..
 It all seems a bit strange.....
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 Others have answered but here is an example.
Guy I know at a service station got a call, They said "are you phil?" .
Phil says "yes".
Phil gets charged for yellowbook advertisement.
Phil calls company and hears a different question with his "yes" answer.