A free app for Android, by Coder inc.

In today’s world, it is extremely difficult to keep your contacts organized. Most people use a phonebook to keep track of their contacts, but this can get very annoying, especially if you are trying to reach a certain person and cannot find their number in the phonebook.  After that, you can easily keep track of your call history, and also block unwanted calls and messages. This is very convenient and can save a lot of your time and effort.

The app is extremely simple and easy to use.