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It depends on how much it is worth to you in effort but you can:
1) Download or subscribe to one of the NPA/NXX databases out there, then hit the db with the dial string to validate that at least the area code and prefix are correct
2) Subscribe to a reverse lookup service such as 411.com or Targus to validate the phone number
Thank you, we have a db with the valid NPA NXXs , I should be able to do that.