I got this router for a customer and it didn't support her 3G USB modem.
Go to
Netgear 3G for router info and
3G Modems for a list of supported modems.
It would be wise to check the 3G modem box for the model number. The newest Bigbond modems have 7.2 written on the modem but that is not a model number
This unit is new with warranty. $90 posted.