It simply rejected calls that lacked caller ID, which is what I assume the GP meant by unknown callers. It wasn't only Nokia either, every single phone that I have ever owned has been able to do this. Its right there alongside novel features such as "sending a text" or "making a phone call."
If you meant the Pixel feature then there are probably lots of videos and posts covering it.
I have one from Verizon since they are my carrier. For free it does an amazing job blocking spam calls. If I was willing to pay (I’m not) it would tell me what kind of spam call it is.
Not worth the price.
I still don’t answer calls unless they’re in my address book or I’m expecting one. But I get very very few calls anyway thanks to the app.
And they are allowed to leave voicemails, which they never do. Real callers do if I get an unexpected genuine call.
Add in the features iOS has had in the last few releases to be able to see transcriptions of voicemails, now live as they’re being left, and most of the hassle is gone.
The spammers trained everyone to stop answering. I shouldn’t have to do any of this. But it’s better than it was a few years ago.
