The service was developed in response to evolving Federal Communication Commission (FCC) rules under the Telephone Consumer Protection Act (TCPA) that now dictate companies must have permission not just to send marketing messages to mobile numbers but also to have explicit consent to contact the owner of that number. Failure to comply can lead to large fines for offending companies. With some 45 million U.S mobile numbers typically reassigned every year, just one communication to a number with a new owner could trigger a fine of $500, increasing to $1,500 per contact for offenses deemed to be deliberate.