How many times in a month you get call from unknown numbers, and in case if you expecting any important call, you call back to that mobile number and some time it comes out to be complete waste of your precious mobile bill.
Bhartiyamobile is a web service which will let you to trace mobile number in India for free. You an simple enter any Indian mobile number and find its mobile sim provider and its Indian state location.
Link : Bhartiyamobile
If you know any other such service, do let us know.