The more syncing and sending of data that happens in the background, the more rapidly your battery gets depleted. Steps to disable background apps on Samsung Galaxy S9 and S9 Plus. Background apps are very much useful for better multitasking. So rest assured, you're not wasting any precious data. The only difference will be when you tap the option that says “Restrict background Data”, this will need to be Toggled. If you don’t want to restrict all apps, you can leave the switch On (green) and disable specific apps using their corresponding switches.
The latest version of Android has great power management features that place limits on background apps and therefore extend the battery life of your phone.

If you restrict the background data on any of these apps, you will save some of those bytes, but the apps may not work properly unless you are connected to Wi-Fi. Take note that when you restrict background data on your Samsung Galaxy S9 or Galaxy S9 Plus, you will still have full functionality of the wireless connection on your Device. But it will do so when you're using WiFi.

From Settings, search for and select Data saver. When the switch turns gray, apps will no longer use your data plan in the background. To Disable App backgound data usage, please see: How to Restrict App Background Data for a Samsung Galaxy S6, S7, S7 Edge, J3, J7, S8+ and S8
As you install more and more apps on your Android, you may become concerned with the data that some apps may share while running in the background. Open Settings Tap Apps; Select the desired app; Tap Mobile data ; Enable Allow background data usage; Additional Notes. Enable App background data usage; Environment. By Mitch Bartlett 15 Comments. Next, tap Data saver again, and then tap the switch. Android: Enable or Disable Background Data. Turn off "restrict background data"when using medium power mode I am using an s9 exynos (android 10 and oneui2)and I see no option to toggle restrict background data whenver I use medium power mode. Slide the “Background App Refresh” switch to the Off position. Objective. Step 7: Enter number you set data warning in GB/MB and tap on SET. 11 ways to trick Android into using less data. But in many cases too many backgrounds apps can cause you a … It is a tough call – and personal choice – to decide whether or not you wish to restrict the data usage of certain apps. With expensive tiered data plans, it's easy to hit your limit. Step 5: Tap on the Settings gear icon in mobile data usage settings. Here you can see the billing cycle and data warning settings for Samsung S9 and S9 plus devices.By default turn on set data warning and turn off set data limit in S9.