honor YAL-L41 Guide De Démarrage Rapide page 7

Dual SIM Card Management
Your device supports dual card dual standby. Under Settings >
Wireless & networks > Dual SIM settings, select the default
mobile data card and calling card as needed.
Dual 4G
If both of your SIM cards support 4G services, when one of
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them is active on a 4G voice call, you will be prompted to
handle any new call to the other SIM card. Answering the
new call will automatically end the active call.
The default mobile data SIM card can still be used for
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Internet surfing on a 4G network when the other card is on
a 4G voice call.
Some of the aforementioned features may be
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unavailable in certain areas due to network
interference.
4G voice services require the support of your carrier's
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network and the deployment of relevant services.
Contact your carrier to activate 4G services.
If this guide is inconsistent with the description on the
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official website, the latter prevails.
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