iPhone 11 Pro
My phone uses a large amount of mobile data
Solution 2 of 6: Your phone is set to high data usage
You can set your phone to use less data for different functions, such as download and playback of high quality content, app updates and more.
Press Settings.
Press Mobile Service.
Press Mobile Data Options.
Press Mobile Data Options.
Press the indicator next to "Low Data Mode" to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.