[SchemaLoad]

ios added "Call screening" which asks unknown callers to explain who they are and what they want before it rings the receiver.

The tricky part for scammers is there is no good answer here, if you claim to be a plumber and the victim hasn't booked a plumber, they won't answer.

[askl]

Google Pixel phones also have this feature since at least 5 years. Spammers usually just hang up instantly.