iPhone SE (2020)
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 the indicator next to "Low Data Mode".
Press the Home key to return to the home screen.