The city wants you to call the phone number in the headline to report on people who have guns, but shouldn’t. A week of communal soul-searching over the murder of 13 year-old Jajuana Cole and other teen shootings climaxed Friday with a City Hall press conference at which Mayor John DeStefano announced a new three-prong “Guns off the Streets Initiative,” including the new 24-7 hotline. Then he stuck around for passionate conversations with activists about how to make neighborhoods safer.