The National Do Not Call Registry is apparently only good for FIVE years. That means that everyone who signed up in 2002 will start receiving those annoying in the middle of dinner calls again.
UNLESS YOU REGISTER AGAIN.
You can sign up cell phone numbers as well. Be sure when you're signing yourself up, you sign up elderly family members who don't have access to the internet!
It takes about 5 minutes tops, and you can opt out 3 numbers at a time. You'll receive an email with a link to click to confirm.
www.donotcall.gov