Huawei Mate40 Pro User Manual page 129

When two SIM cards are inserted, only the default mobile data SIM will support 5G, while
the other will only support 4G/3G/2G.
1
The 5G service depends on the support of your carrier's network and its deployment of
relevant services. Please contact your carrier to activate the 5G service.
2
If your device has two SIM cards inserted, go to Settings > Mobile network > SIM
management, and set SIM 1 or SIM 2 as the default mobile data SIM.
3
Go to Settings > Mobile network > Mobile data, and enable 5G for the default mobile
data SIM.
The 5G service may be unavailable in certain areas due to frequency interference with the
carrier network.
Manage SIM Cards
You can enable or disable SIM cards and name them for easier identification.
Enable or Disable a SIM Card
Go to Settings > Mobile network > SIM management, and enable or disable a SIM as
needed.
Once disabled, a SIM card cannot be used for calling, messaging, or accessing the Internet.
Name Your SIM Card
You can name your SIM cards for easier identification and management. For example, you
could mark one SIM card as "Work" and the other as "Personal".
Go to Settings > Mobile network > SIM management, and touch
name.
Configure Dual SIM Settings
If your device has two SIM cards inserted, you can set the default mobile data SIM and the
default calling SIM, and enable call forwarding between the two SIM cards.
This feature applies to dual-SIM devices only.
Set the Default Mobile Data and Default Calling SIM Cards
Go to Settings > Mobile network > SIM management and set SIM 1 or SIM 2 as the default
mobile data or default calling SIM card.
Enable Call Forwarding Between SIM Cards
After enabling call forwarding for both SIM cards, if incoming calls cannot reach one of the
SIM cards, they will be forwarded to the other one.
This feature requires the support of your carrier. For details, contact your carrier.
1
Go to Settings > Mobile network > SIM management > Call forwarding between
SIMs.
Settings
to edit the SIM card
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