There is a zonal integrated police network (ZIPNET) with details (IMEI numbers) of lost/stolen mobile handsets. "Citizens are advised to check the list of stolen/list mobile handsets on ZIPNET before purchasing a pre-owned mobile phone," Haribhai Chaudhary (Minister of State for Home Affairs) said in the Lok Sabha.
It is good for everyone to note down the IMEI number so that there is a way to track it. Its easy to find for any brand of mobile. Just type *#06# and your IMEI will be displayed.