Your intention might very well be good but this is very bad advice, please do not install Truecaller! This app is a privacy nightmare. From accessing your phonebook/contact info to location, it has been known to be responsible for leaking information of journalists and for storing user data without consent.

> While TrueCaller may have laudable intentions, the privacy implications for people who end up in their database raise concerns. When a number is tagged, the person who is tagged ends up having their name and phone number stored on the TrueCaller database, despite not having consented – or even being aware – that their data was collected.

- https://privacyinternational.org/node/2997

Some of the features require excessive permissions.

- https://support.truecaller.com/support/solutions/articles/81...

- https://globalvoices.org/2022/10/14/the-true-colours-of-true...

My experience with Trucaller is that it does just about nothing. I suspect that by the time a number has been marked as spam, the offender has already switched to a new number. I wouldn’t be surprised to learn that scammers were monitoring Trucaller and it’s ilk to determine when to change numbers.