OxygenOS
On 10 October 2017, a security researcher discovered that OxygenOS system service called "DeviceManagerService" collects sensitive data and transmits it back to OnePlus servers. The service collects many data points, including the serial number of the device, the phone number, IMEI, network connections and time records of user activity in each application. Users can delete the system service through ADB. OnePlus later released a statement on data collection and analytics, arguing that the data is only used to improve and optimize the system, is not shared with third parties and can be disabled by users in system settings. OnePlus also says they are reviewing the data analysis mechanism and no longer collecting certain data.