Setting the default SIM card
You can select a default SIM card for outgoing calls.
This feature is only available on dual SIM phones.
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
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Huawei Mate 10 Manual [PDF]