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Who gave them your phone number?
Unless it comes from the credit card company, it will not stop fraud. It may stop someone logging on four three months and then charging it back if he knows you have his phone number.
But think about it would you give your phone number to a company attached to a porn site? If you were not in the adult business.
There has to be a way that the CC Processor asks for a verification number, this is done from a different site and whne it is given the second site verifies the transaction. The verification number is not kept with the card number.
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