The present invention belongs to the field of smart phones. A usage statistical method for a data usage monitoring technology, and a mobile phone, the method comprising: recording a data usage threshold value of a mobile phone in a screen-off state, recording application programs of the mobile phone that are required to keep running (S101); determining whether the mobile phone is currently in a screen-off state (S102); if not, maintaining an original state (S103); if yes, determining whether a current mobile phone data usage is higher than said data usage threshold value in a screen-off state (S104); if not, maintaining the original state (S105); if yes, closing all mobile application programs except for the application programs that are required to keep running, and sending technical usage data to a data acquisition terminal as preset by a manufacturer (S106). The present method is used to monitor whether a user's mobile phone is experiencing high data usage in a screen-off state. As soon as it is detected t
