D-Link DWM-156 User Manual page 15


Pull the plastic socket slightly, and you can hear a click
when the SIM/USIM card gets unlocked.

Take off the SIM/USIM card.
2) Install the microSD card into the USB modem:
Install microSD card in the USB modem, if you want to use it.
Insert the microSD into the microSD slot from the side of the
modem, the following picture indicates the correct inserting
direction.
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