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D-Link DWM-312W User Manual
Section 4 - Configuration
Mobile Internet
Modem/SIM card
selection
Selecting a single SIM card, either
SIMA
or
SIMB,
will
connect over a single SIM only. Selecting a backup
option will change cause the connection to switch to the
specified backup if the primary SIM cannot connect after
the specified time.
Click a SIM card to display options on the configuration
page.