Huawei P40 lite 5G
Selecting network
You can set your phone to select a network automatically or you can select a network manually. If you select a network manually, your phone will lose network connection when the selected network is out of reach.
Press Settings.
Press Mobile network.
Press Mobile data.
Press Network provider below the required SIM.
Press the indicator next to "Automatic" to turn off the function.
Press OK and your phone will search for networks.
Press the required network.
Press the indicator next to "Automatic" to turn on the function.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.