It's impossible for us to trace your phone, only services providers (in your country like o2 or something) can do this, and only if they have a cour warrant, or i have no idea where you from, but you say the police is lazy offer them a small reward maybe they will help or just go to your isp and ask them for help maybe you get lucky and they will help you out!

And if someone will tell you he can trace it put the money in escrow first and only release the money if you verified his claims and only when you are 100% sure all is correct!

You will get a lot messages from people who claim that they can do it but need to be paid upfront or 50% or whatever