Collin was enthusiastic about his topic and showed how, with a little innovation, you can uncover a lot of information. The meat of his session was showing how mobile phone operators' proxy servers are leaking large quantities of personal information through add HTTP headers -- everything from subscriber numbers to your phone number -- with each web request. He also provides a service for you to test your phone, with the promise not to log your information. Browse from your phone to http://www.mulliner.org/pc.cgi for a list of data your carrier may be sending to every site you surf. You can also download Collin's presentation from his website.