Yes, this scared me out too. So apprantly your android device can be hacked very easily. Here is a link to the video that shows you how, though its about 1 hour long. If you would rather want to know the gist of it than watching it the whole way through, read on! And for those who want to watch the video: http://revision3.com/hak5/the-android-kos-attack User scenario A: You have rooted your phone and adb access (USB debugging) is active - this case it makes it very easy for the hacker to gain access. To begin with there is a tool that is installed on the hacker's phone, lets call it phone A. Now you leave your phone (Phone B) alone in a party or a public place, the hacker gets his chance and connects his phone to yours using a USB OTG cable which he/she obviously carries. Runs a script on phone A which takes advantage of an android api that allows the script to run an application over the lock screen! Once the application is runnig, you can open the main menu and do what not