Well it is really a problem if your mobile is lost. The following is a technique that I read in a Blog and hope it works.
1: dial *#06# from your mobile.
2: Now note down the IMEI number which will help u in recovering the mobile.
3: If your mobile is lost or stolen you can sent the following form to email@example.com
Last used No.:
E-mail for communication:
Sent the mail and within 24 hours a reply will tell you where your mobile is.
Note : This way is not working in Pakistan