Huawei Mate 9 - Manual (Page 13)

Disabled SIM cards cannot be used to make calls, send messages, or access the Internet.
Naming a SIM card
By default, each SIM card is named after the carrier. You can rename your SIM card to make it
easier to identify.
1
Open Settings.
2
Touch Dual SIM management
3
Select a SIM card. Enter a name and touch OK.
Features may vary depending on your carrier.
Selecting the default mobile data SIM
You can select a default SIM card for mobile data services.
1
Open Settings.
2
Touch Dual SIM management.
3
Touch SIM 1 or SIM 2 next to Default mobile data.
Features may vary depending on your carrier.
Setting the default SIM card
You can select a default SIM card for outgoing calls and messages.
1
Open Settings.
2
Touch Dual SIM management
Getting Started
7