Better than Truecaller
I was a user of TrueCaller for about a year before trying this app. In the last three months I have noticed that this app does a better job of identifying spam then TrueCaller. Hiya seems to identify spam better. Know if iOS would only let it tell me before answering if it is spam.
TollyCat about
Hiya: Spam Blocker & Caller ID, v2.0