You can reduce the number of unwanted sales calls you get by signing up for the National Do Not Call Registry. It’s free. Most legitimate companies don't call if your number is on the Registry. If a company is ignoring the Registry, there’s a good chance that it’s a scam. If you get these calls, hang up and be sure to file a complaint with the FTC (Federal Trade Commission).
 
Register your number by phone or online.
Add your phone number for free by visiting donotcall.gov, or calling 1-888-382-1222 from the phone you want to register (TTY: 1-866-290-4236). If you register online, you will receive a confirmation email from donotcall.gov. You must click on the link in the email within 72 hours to complete your registration.
 
How long does it take?
Your phone number should show up on the Registry the next day. Most sales calls will stop once your number has been on the Registry for 31 days. You can verify that your number is on the Registry by visiting http://www.donotcall.gov or calling 1-888-382-1222.
 
Who can still call me?
After you register, other types of organizations may still call you, such as charities, political groups, debt collectors and surveys. The Do Not Call Registry prohibits sales calls.
 
What if I get an illegal sales call?
Hang up on them and file a complaint. If your number is on the Registry, and you get a sales call, or you get an illegal robocall, don’t interact in any way. Don’t press buttons to be taken off the call list or to talk to a live person. Doing so will probably lead to more unwanted calls. Instead, hang up and file a complaint with the FTC. 
 
To date, the FTC has sued hundreds of companies and individuals who were responsible for placing unwanted calls, and has obtained over a billion dollars in judgments against violators. In addition, the FTC is leading several initiatives to develop a technology-based solution. The FTC has sponsored a series of robocall contests challenging the tech savvy public to design tools that block robocalls and help investigators track down and stop robocallers. The FTC also is encouraging industry efforts to combat caller ID spoofing.