Chapter 7 Broadband
Nebula Mobile Router User’s Guide
122
7.7 Cellular Dual SIM
Some Zyxel Devices support dual SIM card slots for cellular backup (failover) to ensure Internet
connectivity. To see if your Zyxel Device supports Cellular Dual SIM, see Section 1.1.1 on page 17. Use this
screen to set the main SIM card slot and configure cellular backup with dual SIM cards.
To enable cellular backup on the Zyxel Device, select Auto in the Preferred SIM Slot field and enable
Switch when Detach.
Click Network Setting > Broadband > Cellular Dual SIM. The following screen opens.
Figure 68 Network Setting > Broadband > Cellular Dual SIM
The following table describes the fields in this screen.
Table 33 Network Setting > Broadband > Cellular Dual SIM
LABEL DESCRIPTION
Dual SIM
Preferred SIM
Slot
To have the Zyxel Device automatically detect and choose the SIM card slot that has a SIM card
inserted, select Auto. If both cards are inserted, the primary Internet connection uses SIM 1, and
the cellular backup connection is SIM 2.
To have the Zyxel Device only use the SIM card in slot 1, select SIM 1. There is no cellular backup. If
the SIM card is in slot 2, then the Zyxel Device won't have Internet access.
To have the Zyxel Device only use the SIM card in slot 2, select SIM 2. There is no cellular backup. If
the SIM card is in slot 1, then the Zyxel Device won't have Internet access.
If you change from SIM 1, SIM 2 to Auto, the Zyxel Device will choose the SIM card slot you
previously selected if it has an inserted SIM card.
Switch and
Detach
To enable cellular backup on the Zyxel Device, enable the switch (to the right).
Cancel Click Cancel to return to the previous screen without saving.
Apply Click Apply to save your changes.
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