Many of us use Location Services & GPS on smartphones but Cell Phone Companies have been able to track us for a long time. Professor Derek McAuley explains. Blindly Accepting Terms & Conditions https://www.youtube.com/watch?v=9Hb2oMlRI0I Security of Data on Disk https://www.youtube.com/watch?v=4SSSMi4X_mA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels