OnePlus
Enable or Disable Background Data for Apps auf OnePlus
Background data lets an app stay active without being open. It can sync mail, refresh feeds, or check for messages while running in Oxygen OS in the background, and all of that traffic counts against your mobile data plan unless you are on Wi-Fi.
On a OnePlus phone this setting exists per app, so you can leave it on for apps that need instant updates and turn it off for everything else. The relevant switch sits under an app own network settings, not in a general data-saver menu.
Where to find the setting
Open the Settings ➔ Apps & notifications ➔ See all apps ➔ choose the app you want to change ➔ Mobile data & Wi-Fi ➔ enable or disable Background data.
Disabling background data does not close the app or delete your data. It only stops that specific app from using mobile data while it is not on screen; it can still update normally over Wi-Fi.
For messenger apps such as WhatsApp, leaving background data enabled is usually the better choice, otherwise new messages and calls may only arrive once you open the app manually. For apps you rarely use or that do not need instant updates, disabling it is a safe way to reduce data usage without losing functionality when you actually open them.
