Those who are receiving unwanted calls must first request their phone number be added to the National Do Not Call Registry at www.donotcall.gov (http://www.donotcall.gov)
Secondly, remove all contact information from social media or any other sources where your cell phone number or email address could be found randomly online. Don't forget about the apps on your smart phone that may have access to not only your personal data but those in your contact list as well. Telemarketers can easily search based on "likes", demographics or geographic area and pull up your personal cell phone number or email address. This will also prevent ex-girlfriends or stalkers from finding your information as well.
Finally, once all of your information is removed from social media and added to the do not call list, you will want to find a way for the people you want to be contacted by to be able to find you. Go to http://www.netsearch411.com and complete their free, simple profile. NetSearch411.com is the largest, safest, and most private people search (http://www.netsearch411.com/