The Google Contacts app could also soon present a Lookup button previously only visible in the Phone app.

The Google Phone app works surprisingly well if you want to block phone numbers or just want to block spam calls in particular. Google recently added the ability to report calls as either spam or scam to the Phone app. When you long press on an entry in the call log and select Block or report, you can select from the two options for reporting as spam or scam and separately choose to block the phone number. When you report the number, it gets reported to Google without further context. A future update could improve this reporting process with a feedback mechanism for scam calls.