D-Link DSL-2750U User Manual page 29

If the 3G network card is installed, you may click the button on the Action column
to establish or disconnect the 3G connection.
Information: Click this button to display the information of the 3G network

card.
Upload Driver: For an un-supported USB dongle, click this button to upload

the new driver for USB support. The driver will be a text file which should be
obtained from your 3G dongle provider.
Pin Manage: Click this button to manage the PIN.

The following modes of PIN management are shown.
Enable PIN protect: If you Enable it, you need to enter the PIN code when

rebooting or inserting the USB device.
Unlock with PIN code: If you Enable it, you need to enter the PIN code

when using a 3G device.
Unlock with PUK & PIN: If you Enable it, you need to enter the PUK code

when failing to enter the correct PIN code 3 times.
Change PIN code: Choose this to change the PIN code.

Click Add in the 3G Mobile Setup to display the following page.
DSL-2750U User Manual
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