FWIW, i've been working on an application for a while now that can compromise proxies and reveal the originating ip. I may offer it to the forum as a means of tracking and identifying suspected scammers, and discovering their personal information. I've already tested it against a basic proxy and i am able to get the ip address of the user hiding behind the proxy. this method involves sending crafted headers that force a request to an addition resource, exploiting a flaw in http 1.1 and therein bypassing the proxy.
That's fine but what if they use a mobile dongle?
Catch me if you can dickhead