But this is a method you can use to reduce data usage on Android. 1. Go to Notifications. Pull down the notification bar (on some devices) or go to the main Settings menu. 2. Turn Off Data. Toggle off the Mobile Data. If you are going the Settings route, you will also need to select Data Usage.Checking your mobile data usage on Android phones is easy. Swipe down from the top of the screen on any menu. Then, tap the gear icon. Finally, tap Connections -> Data Usage. From this menu, you can check your data usage on your Android phone.Slide your finger down the display starting from the top edge of your mobile phone. Tap Mobile data to turn the function on or off. Tap the Home key to return to the home screen.
How to reduce mobile data usage on Android devices?
1. Limit your data usage in Android Settings. Setting a limit to your monthly data usage is the easiest thing you can do to avoid using surplus amounts of data without your knowledge. You can limit your mobile data usage on Android via the Settings app. Head over to the Settings and tap on Data Usage>>Billing Cycle>>Data limit and billing cycle.
How do I check data usage on my Android phone?
On your Android phone or tablet, swipe down from the top of the screen once or twice and then tap the “Gear” icon to open the “Settings” menu. The location of the “Data Usage” settings varies by device, though the tools are mostly the same.
How do I Turn on data usage warning on my phone?
Set Mobile Data Usage Warning 1 Open your phone's Settings app. 2 Tap Network & internet Data usage . 3 Tap Mobile data usage Settings . 4 Tap Data warning . If needed, first turn on Set data warning . 5 Enter a number. To switch between megabytes (MB) and gigabytes (GB), tap the Down arrow . 6 Tap Set . See More....
How do I Turn on/off Mobile data on my Device?
To switch between megabytes (MB) and gigabytes (GB), tap the Down arrow . Tap Set. You'll get a notification. To turn mobile data back on, follow the steps above and turn off Set data limit. Tap Network & internet Data usage. Tap Mobile data. Tip: You can conserve data by turning off mobile data access.

Below are two helpful articles on a similar topic 👇
What happens if you don't manage your mobile data properly?How do I Turn Off data usage on my Android phone?