How can I track a lost or stolen Iphone for free without mobileme?

My iphone is lost and all the tracking stuff is expensive|||It's not possible.|||You need contact the service provider, no tracking stuff will work if you had not installed previously, expensive or not.|||Do you have the IMEI number? If you dont it can usually be found on the box it came in. Give this number to the cops then they have sexy time!|||Your phone company should tell you|||If you have the iPhone 4 the mobile me tracker is free :)