The default settings on some Oppo phones will kill off apps that need to run in the background. The phone manufacturers are killing of apps that run in the background to conserve battery use. Unfortunately, the user is not told by the phone that these apps will be killed off, leading to frustration that the app does not work. In the case of the Unforgettable app, terminating the app when running in the background means that you can't collect any data. Fear not, in the video below we will show you how to turn off these app killing settings.