https://white-pages-reverse-phone-search.govbackgroundchecks.com/
Whitepages free reverse phone lookup service allows you to enter a phone number and quickly find out who called you. Find the phone owner's full name, address, ...

https://www.reddit.com/r/OSINT/comments/yy0vv0/how_do_i_do_a_reverse_phone_lookup_for_free/
19 votes, 33 comments. So I have a phone number someone wanted me to lookup for an investigation I'm doing to help someone out.

https://www.youtube.com/watch?v=j8-iCz5ZfVY
Easily look up any phone number using this free tool and find out who is calling! Free Reverse Phone Number Lookup: ...