AT&T has a free app for its customers that automatically blocks scam calls for iPhones 6 and higher and Androids that can use AT&T HD Voice.
T-Mobile offers free scam call-blocking
And Sprint and Verizon have apps that display the caller's name on your incoming screen for callers who are not already in your Contacts List.
Verizon has also made it easier to sign up with the popular robocall blocker, Nomorobo.
Consumer Reports recommends that consumers closely evaluate what kind of information they're willing to disclose to prevent robocalls - so look at the terms and conditions when signing up. Another way consumers can fight back - report robocalls to the FTC. Just write down the number and enter it at Complaints.DoNotCall.Gov. To learn more about the steps you can take to protect yourself from robocalls, visit EndRobocalls.org.