How to trace my lost nokia 6275? PLEASE HELP?

HI, I am in mumbai, India and I have just lost my nokia 6275. It was a reliance handset. I have all the rsn and esn details. How can I get my handset back? I need my handset back really badly coz its got all my data stored in it and it can be misused if in wrong hands. I do not want to disable the phone. Just want it back by either tracking it down or getting the number that is currently active on the handset. Please tell me how do I go about it... PLEASE HELP ME!! I had actually left my handset in a taxi and havent got it back ever since. This was 2 days ago. I have tried locating the taxi but to no avail. So anyhow I want my phone back!! I know that when a number gets activated on a particular handset, some of the details of the handset like the esn/rsn/imei no. go to the service provider of the sim card. Can that help?? BTW, is this information even true??