A free app for Android, by 7s Star.

Get to know who is calling and in which city with the most detailed data about your calls. This handy app also lets you track incoming and outgoing calls. It not only gives you a complete history of your calls, but you can also see the number, location, and even the date and time of the call. If you want to know more about the person who is calling, you can easily look up their name, address, and even their phone number. You can even find out if the person is a friend or a family member of yours. This app is perfect for tracking and finding out more about the people you are talking to.