iPhone 12
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My phone uses a large amount of mobile data
Solution 3 of 6: Mobile data usage for applications is turned on
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.
Press Settings.
Press Mobile Service.
Press the indicator next to "Mobile Data" to turn the function on or off.
Press the indicators next to the required applications to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.