Huawei Y3 2017 Guide De Démarrage Rapide page 7

Dual card dual standby single pass
Your phone 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 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
card 2's data service will be disabled.
Your phone's single pass feature helps reduce power
consumption and increase your phone'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.
Dual SIM functionality is only available on 2G(GSM)
networks, dual SIM functionality will not work in
some countries (e.g. Singapore, Australia).
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