Tim Cook, Chief Executive Officer of Apple Inc., takes a selfie with a customer and her iPhone as he visits the Apple Store in Chicago, Illinois, U.S., March 27, 2018.

The feature is called "Silence Unknown Callers," and it's built into the phone settings app. Here's how to use it.

iOS 13 , which is already available for beta testing ahead of its September launch, will help you ignore those annoying robocalls you keep getting . It doesn't block the numbers entirely, but it will help you stop your phone from ringing at all if an unknown number calls.

Open Settings.

Tap "Phone."

Now scroll down and toggle the option to "Silence Unknown Callers."

This automatically sends unknown callers to voicemail. There are times where you might want to leave this off, though.

If you're expecting a call from a doctor you might not have in your address book, then you should turn the feature off to prevent their call from going to voicemail. Or, if you regularly receive important calls for business that you might not always recognize, then again this feature might not help you much. At least everyone can still leave you a voicemail.

Google has a feature I like even more on its new Pixel phones, which automatically screens calls and uses the Google Assistant to speak with the person on the other end. I don't see Apple adding something similar soon, but it might not need to if wireless carriers are able to do a bulk of the blocking on their end.