Huawei P9 Plus User Manual page 23

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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.
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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.
Enable or disable a SIM card
Select 4G/3G SIM
Select default SIM for data services
Configure SIM settings for phone calls
Select SIM display mode for phone calls
First Use and Initial Setup
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