Whoscall
With Whoscall, you can instantly identify the calls and SMS text messages not in your contact list. Whoscall also helps you block unwanted numbers and texts like spam, scams, telemarketers, robocalls and more.
Make sure you open the app after installing

You must keep the app installed for at least 10 days!

You must open and use the app on 3 separate days to get credit!

If you uninstall mCent, you will NOT get credit