Tracing a mobile phone number to its location in India is difficult. There are quite a number of hurdles and there aren’t really functional services in India that actually let you pin point and trace a mobile phone number in India.
Reverse lookup services weren’t very accurate when I tried to trace the location of a mobile phone number in India, but they could just help you in finding at least the state where these mobile phones are operating from.
You can use this page on Bharatiyamobile, or this international reverse lookup service from TP2 Location or this page by Hacktrix that could help you trace a mobile phone number in India. Let me know in the comments if you have had any success with any other service in tracing a mobile phone number in India.