Register your phone numbers free on the National Do Not Call Registry
Added
Add your home and cell numbers at DoNotCall.gov (or call 1-888-382-1222 from that phone). Confirm the email link within 72 hours if you register online. Registration does not expire. It reduces sales calls from companies that follow the law; it does not stop scammers, so still use call blocking and report illegal robocalls at DoNotCall.gov.
The result
Result: FTC: free registration at DoNotCall.gov; your number should appear the next day and sales calls from complying telemarketers can take up to 31 days to stop. The Registry does not block scam or illegal robocalls.
Source
Federal Trade Commission (FTC) (opens the original source in a new tab). Check it for the latest numbers before you act.