BookYourData checks every Direct Dials number before delivery. Direct Dials is a done-for-you service that finds direct dials and mobile numbers for the people you name. Before a file reaches you, each number is checked as a direct dial or a mobile number, and each number is checked for being dead. Mobile numbers are checked with the phone network at no separate charge.
The checks happen before the file is delivered, so the numbers you receive have already passed them. A number that fails a check does not go into the file.
The structure of a Direct Dials file keeps the number types separate. The mobile column holds only mobile numbers, and the direct dial column holds only direct dials. A company main line never reaches the file, and a dead number never reaches the file either. Numbers that fail the checks never reach the bill.
For more about Direct Dials, visit bookyourdata.com/direct-dials. More help articles are available at intercom.help/bookyourdata/en/.