That number is the do not call registry.

https://www.donotcall.gov/default.aspx

Yes, you may place your personal cell phone number on the National Do Not Call Registry. The registry has accepted cell phone numbers since it opened for registrations in June 2003. There is no deadline to register a home or cell phone number on the Registry.

You may have received an email telling you that your cell phone is about to be assaulted by telemarketing calls as a result of a new cell phone number database; however, that is not the case. FCC regulations prohibit telemarketers from using automated dialers to call cell phone numbers. Automated dialers are standard in the industry, so most telemarketers don’t call consumers on their cell phones without their consent.

THERE IS NO DIRECTORY OF CELL NUMBERS BEING RELEASED AS ALLEGED IN THE EMAIL.