Truecaller has an awesome user interface which is very ease to work. It automatic organizes the text messages in our phone to different categories like spam and inbox. When we receive calls from unknown number that is not in our contacts then this application search the contact name in our friends contacts.
The main important feature in this application is that we can block the text messages and calls so that we cannot receive calls or messages from them instead we get notification that call or message is blocked.
This application is very much useful.