Huawei B315 LTE CPE Quick Start Quide page 5

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Setup
Insert a SIM card into the SIM card slot as shown in the preceding diagram
and then connect the power adapter to the B315 router. The router will turn
on automatically and search for available mobile networks.
The following indicators will turn on when the router has successfully
connected to a network.
Cyan/blue/yellow:
Connected to a mobile
network.
Do not insert or remove a SIM card when the router is running, as this may
affect performance or damage the SIM card.
White: More signal bars
indicate a stronger signal.
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