Setting the default SIM card
You can select a default SIM card for outgoing calls.This feature is only available on dual SIM phones.
1 Open Settings.
2 Touch Dual SIM management.
3 Touch Default calling SIM and select your desired SIM card.
After you have selected the default SIM card, SIM 1 and SIM 2 will no longer be displayed on the
dialer.
Questions about your Huawei Mate 10? Post in the comments!
Huawei Mate 10 Manual [PDF]