A free app for Android, by NdroiDev.

Caller ID Lookup is a FREE application to find out who is calling you. With this app, you can check the phone number of any person in the world, and you will be able to identify their country, city, area code, and phone number.

If you want to find out who is calling you, this is the best application to use. It is 100% free and does not require any personal information or registration. You can search by number, name, or keyword globally using different country codes.

The best part of this app is that it is free and supported entirely through ads.

You can find out who is calling you by entering a phone number, and the app will attempt to lookup the name.