. >> 48 hours earlier, kenneth schmidgall is rocking out at a concert when his iphone disappears. >>cause i have the iphone tracker. >> the iphone tracker, or find my iphone app, uses gps satellite to provide the location of a missing device. >> when i first logged into the find my iphone app, i saw it stationary in encinitas, and it kept staying there all day so i figured maybe somebody at the show found it. when i woke up sunday morning and checked the tracker again, it moved all the way to carlsbad. at that point, i knew it was on somebody. >> schmidgall and his roommate, greg, watch the iphone make its way around the san diego area. in an effort to reach the person who has the phone, the friends send a few kind words using a find my iphone feature on kenny's computer. >> you can do a message to the iphone tracker, so i was sending alerts and said, hey, this is my phone. if you can contact me that would be wonderful. >> when they get more response, they send more aggressive messages. >> i kept changing the message every once in a while. i know where you are, i know you have my pho