The Burner and Nomorobo partnership adds the latter's call-blocking features and "massive" blacklist of known telemarketers to prevent those calls from ever reaching your phone. (Or, in this case, your temporary Burner number.) Incoming calls are checked against Nomorobo's database and then automatically screened. Although you can blissfully ignore those calls if you like, the Burner app places them in a "Filtered Calls" section of your call history so you can review them later. Incorrectly filtered calls can be whitelisted and moved to the Inbox just like checking your email spam folder.
Burner users with a Premium $4.99 monthly subscription can add Nomorobo's services to their account simply by updating to the latest version of the app. Nomorobo will be enabled by default in both the iOS and Android versions.