Huawei P40 lite 5G
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Selecting dual SIM settings
When you insert two SIMs into your phone, you can make calls and send and receive messages from both SIMs. You can also select a default SIM for mobile data usage.
Press Settings.
Press Mobile network.
Press SIM management.
Press the indicator next to the required SIM to turn use of the SIM on or off.
Press the field next to “Default mobile data” below the required SIM.
Press Default calling SIM.
Press the required setting.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.