Charles wants to know how he can stop robocalls. Leo says robocalls have become an epidemic and up to 80% of all your calls are now spam calls. It's ridiculous. But there are efforts underway to do away with them. AT&T is working on a new technology called "Shaken and Stir" which will authenticate the caller before people even get the call. AT&T also has an app called AT&T Call Protect. Available on iOS or Android, and third-party apps like NOMO ROBO that can block them. Charles may also want to register his number on the donotcall.gov list. Or he could just ignore any call and see if they leave a message.