How to screen calls on an Android phone
Briefly

Google has gradually added a range of built-in features to detect and deal with unwanted callers, including flagging suspicious numbers and blocking nuisance callers.
Using Google's Phone app, when an incoming call is not from a contact, it can send the number to Google for verification against a spam database.
On Samsung phones, the Smart Call feature serves a similar purpose as Google's functionality, allowing users to identify and block unwanted calls.
To take advantage of the spam detection features, users must ensure that settings like Caller ID & spam are activated on their Android devices.
Read at The Verge
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