Huawei Mate 8 - Manual (Page 31)

First use and initial setup
24
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If you disable a SIM card, you will be unable to use it to make calls, send messages
or access the internet.
•
Select Dual SIM calling. You can configure whether you want to select a SIM card
manually or use the default SIM card each time you make a call. If you choose to
use the default SIM card, your phone will use that SIM card for all outgoing calls.
Connecting to the Internet
Stay connected round the clock with your phone's Wi-Fi or mobile data connection.
Connecting to a Wi-Fi network
1
Swipe down from the status bar to open the notification panel.
2
In the Shortcuts tab, touch and hold to open the Wi-Fi settings screen.
Select SIM card display mode
for phone calls