The National Do Not Call Registry gives you a choice about whether to receive telemarketing calls at home.
Most telemarketers should not call your number once it has been on the registry for 31 days. If they do, you can file a complaint at this Website. You can register your home or mobile phone for free.
Unfortunately, scammers have been making phone calls claiming to represent the National Do Not Call Registry. The calls claim to provide an opportunity to sign up for the Registry. These calls are not coming from the Registry or the Federal Trade Commission, and you should not respond to these calls.
To add your number to the Registry you can call 888-382-1222 from the phone you wish to register, or go to https://www.donotcall.gov
You can put up to 3 numbers on the list and your registration will not expire. Telephone numbers placed on the National Do Not Call Registry will remain on it permanently due to the Do-Not-Call Improvement Act of 2007, which became law in February 2008.
Read more about it at http://www.ftc.gov/opa/2008/04/dncfyi.shtm