Does the "Caller ID & spam" option block spam by default or do you have to add them to blocked list?

[Pwersha]

Does the "Caller ID & spam" option block spam by default or do you have to add them to blocked list?

I have noticed that sometimes my phone will ring very briefly, I will see it pop-up a number and even cause an alert on my Garmin watch, then when I look at my history there is no record of it. There is no missed call notification either. Is this the spam feature blocking it but a little delayed so it rings for a sec? There are no numbers on my blocked list.

According to the support doc from Google, it doesn't mention any blocking unless
https://support.google.com/nexus/answer/3459196?hl=en

Running 7.1.1 on a Pixel 5

 

[Rukbat]

Re: Does the "Caller ID & spam" option block spam by default or do you have to add them to blocked l

The callerID is sent between the first and second rings, and the phone has no way of identifying the caller until then - so you;ll usually get at least part of the first ring. (The actual 'ring' in the system and the ring on your phone aren't always in sync.)