I have been looking for this for a long time. I knew it was Possible to trace only BSNL Landlines but I didnt know Tracing Mobiles was Possible. After Googling it for a While I found a Solution.
Using the sites provided below you can easily track down who had been sending you prank calls from an Unknown Number.
This service provided by InformationMadness and BharatiyaMobile has a database of all mobile operators and its numbers that are operational in India, I would prefer the former one as it gets updated regularly with latest numbers. So, you too may check out the service area details of any Indian mobile number.
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You can also see how to Send Free SMS with more than160 Characters to any Mobile in India.