Trace Mobile Number is a free Android application developed by Droid Copz. It allows users to track the location of incoming and outgoing calls, find out which state/telecom operator a mobile number belongs to, and view caller information during the call. The application offers several features such as offline tracking, updated mobile number databases, and a list of contacts with area and operator names. Additionally, users can find addresses from the map, view STD codes of Indian cities, ISD codes of all countries, PIN/ZIP codes of all important Indian cities, and all incoming and outgoing call information for all calls.

The application is ideal for those who receive calls from unknown numbers and want to know where that person is calling. With its updated mobile number database, it includes the latest numbers, landline numbers, and toll-free numbers. The app works offline as well, which means no internet connection is required. Users can also customize the settings according to their preferences and choose whether they want to see the location of the caller while receiving or making a call. However, it is only applicable for Indian mobile and landline numbers.