Huawei ALP-L09 Guia De Inicio Rapido página 15

Dual card dual standby single
pass (only applies to ALP-L29)
Your device supports only dual card dual standby single
pass, which means you cannot use both SIM cards for
calls or data services simultaneously.
When you are on a call using SIM card 1, SIM card 2
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cannot be used to make or answer calls. If someone
calls SIM card 2, the caller will hear a voice message
similar to "The subscriber you dialed is out of the
service area" or "The subscriber you dialed cannot be
connected for the moment, please try again later."
The actual message will vary by service provider.
When you are using SIM card 1's data service, SIM
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card 2's data service will be disabled.
Your device's single pass feature helps reduce power
consumption and increase your device's standby time. It
is not related to your service provider's network
conditions.
It may be a good idea to contact your service provider
and subscribe to missed call reminder and related
assistance services to avoid the conflicts mentioned
above.
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