This article provides a narrative beginning in 1999 of investigations by the Metropolitan Police Service (Met) of Greater London into the illegal acquisition of confidential information by agents in collaboration with the news media that is commonly referred to as the phone hacking scandal. The article discusses seven phases of investigations by the Met and several investigations of the Met itself, including critiques and responses regarding the Met's performance. Separate articles provide an overview of the scandal and a comprehensive set of reference lists with detailed background information.