Huawei P40 Pro
Android 10.0
Select help topic
1 Find "Mobile data"
Press Settings.
Press Mobile network.
Press Mobile data.
2 Turn data roaming on or off
Press the indicator next to "Data roaming" to turn the function on or off.
If you turn on the function, press OK.
3 Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.