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.
Step 1 of 8
Slide two fingers downwards starting from the top of the screen.
Step 2 of 8
Press Mobile data to turn the function on or off.
Step 3 of 8
Press the settings icon.
Step 4 of 8
Press Mobile network.
Step 5 of 8
Press Data usage.
Step 6 of 8
Press Network access.
Step 7 of 8
Press the field next to the application name in the "Mobile data" column to turn the function on or off.
Step 8 of 8
Slide your finger upwards starting from the bottom of the screen to return to the home screen.