The free phone number validation API offers anonymous, free phone number validation for use with your website. Before entering your phone number into any web software or website, it will check and cleanse it. Verifying the phone number is crucial since you want to make absolutely sure it is not an unauthorized one. Whether a phone number is legitimate, invalid, or unknown is disclosed via the API. By verifying phone numbers at the point of entry into your database, you can prevent fraud and maintain the integrity of your user database.