Identify unknown Incoming Calls- True Caller

TrueCaller is a mobile application that shows who the caller is instantly on incoming calls if the number is not stored in your phone book. Even if you receive a call from abroad, you can still identify who the caller is, if the number is publicly available. If the number is not publicly available we can still display which city or country the number belongs to.
The Caller ID functionality is available for Android Phones, Symbian Phones and Windows Mobile phones. Blackberry will be supported soon. TrueCaller will always work, provided you have 3G or EDGE or WiFi connection on your cellphone and the number is available on reverse phone number lookup services.
TrueCaller is the most used Caller ID application on the market with social media integrations and intelligent call blocking functionality against spam calls. Visit m.truecaller.com from your phones browser to get TrueCaller.
A large number of countries including India (Ahmedabad, Bangalore, Calcutta, Chennai, Delhi, Hyderabad, Mumbai) support Caller Id application of True Caller. List of countries that support True Caller

SMS-Popup

TrueCaller displays a preview of the incoming text message. If the sender´s number is not stored in your phonebook, TrueCaller will try to detect it and display the name of the sender. The SMS Popup functionality is available for Android, Symbian and Windows Mobile and is enabled by default in TrueCaller.

Name and Number search

Search among 200 million numbers in more than 25 countries around the world. With TrueCaller you can easily make a name or number search by simply entering the phone number and pressing search.

Map and directions

TrueCaller has an integrated map functionality which allows you to display the address of the caller on a map. With one single click in the history or in the TrueCaller call dialog you can get a map overview.