. >> joining us now is toby stanger at consumer reports here to talk about stopping unwanted calls once and for all and toby, just why are these calls so rampant? when i am home during the day >> the reason is it's cheap to have a rowbocall system. they know how to spoof the numbers and make it look like it's a real call and then it makes it difficult for consumers to identify them as robocallers and scammers and difficult for regulators to track them down. >> some of my colleagues were talking about being on a do not call list, what can you do to stop this? >> there is opportunity through the tell codes to get some blacklists created. really -- >> blacklist, is that something they do through the ftc or -- >> you go through your telephone company and say, i don't want certain numbers to call me. and the roe robocallers change their numbers. >> there is a paid service? >> it's called digi caller block plus. $110 on amazon. we got people to test them and you attach it to your phone and it has a blacklist and a white list of people who you do want to call and it's effective and works silen