Police Commissioner Ray Kelly explained why there are more younger muggers these days: It's the iPhone! The News reports, "Juveniles [ages 11-19] accounted for 29% of the 7,340 robbery arrests and 27% of the 4,566 grand larceny busts this year, an 8% jump in each category compared to this time last year." Kelly said, "The explosive popularity of these devices has also made them inviting targets for thefts. Teens are commonly the culprits as well......