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You can limit your data usage by turning off mobile data. You'll then not be able to access the internet using the mobile network. You can still use Wi-Fi even though mobile data is turned off.
1. 1. Find "Dual SIM & Mobile"
Press Dual SIM & Mobile.
2. 2. Turn mobile data on or off
Press the indicator next to "Mobile Data" to turn the function on or off.
3. 3. Turn use of mobile data for applications on or off
Press Apps Using Wi-Fi and Mobile Data.
Press the required application.
Press the required setting.
4. 4. Return to the home screen
Press the Home key to return to the home screen.