OPPO A77
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Check data usage
You can see how much data you've used when you've used the browser or when you've sent and received email etc.
Find "Dual SIM & Cellular"
Tap Settings.
Find "Dual SIM & Cellular"
Tap Dual SIM & Cellular.
Check data usage
The total data usage is displayed.
Check data usage
Tap Apps Using Wi-Fi and Mobile Data.
Check data usage
The data usage for each application is displayed below the name of the application.
Return to the home screen
Tap the Home key to return to the home screen.