According to the query of the Apple community, the data source of Apple's mobile phone standing refers to the device or application that can record and display your standing time and times in the "health" application. These devices or applications can be Apple's own products, such as Apple Watch, or third-party products, such as Fitbit and mi band. You can view and manage your regular data sources in the Health application, choose which data source to use first, or delete unnecessary data sources.