Google Voice's Screening feature allows you to configure your phone's reaction to calls from outside your contact list. Actions include sending directly to voicemail or asking for the caller's name. You can keep your normal phone number, or you could even get a whole new number! An alternative is Nomorobo for iOS, which compares a caller's number to known scammers/robocallers. However, it requires a paid subscription, unlike Google Voice.
Rick wants to know if there's a call blocker for a landline phone. 95% of the calls he gets are Robocalls. He uses Ooma and they want $120 a year to block calls, so he wants to know if there's a good hardware based option. Leo says that most of the services he sees are generally White listers.
Jerry is using a MagicJack VOiP phone. Leo says it's very affordable at $20 a year. Jerry keeps getting telemarketer calls, though. Is there something that can block that? Leo says that telemarketers are using random dialers to call numbers, or they use lists that have been sold to them. The Feds have the DoNotCall registry, but that doesn't work for telemarketers who operate outside of the country. There isn't really a device that can block incoming unsolicited calls, but Leo advises using Google Voice.