you can only force the police to find ur mobile back.. go to them every week and ask them politely as their SHO to intervene u wont get it in 3-4 months after it has been lost, as the thieve will not switch it on after 3-4 months u can go to commissioners office with an application for it and still policemen are not helping then file an RTI asking them what they have done till now to find your phone and take that rti reply to commissioners office and force him to take action against those policemen