
It would be incredibly slow if you could do it.
The speeds for upload and download are slow for the pc you connect the usb to.
Sharing the slow USB speed would make for unbearable delays.
In my opinion, it is not workable.

As answered by FrankTheTank, you could just bridge traffic through your computer - but I wouldn’t recommend it. As he also brought up, the logical workaround would be getting a 3G wireless device meant to be an access point - like the MiFi devices. What is your reason for doing this, what is the goal? Is it that you want mobile Internet for your laptop, and don’t want to pay for other Internet access for the other two devices? Otherwise, I’d suggest you get some wired Internet access for the other two devices and use the mobile access just for your laptop, because you won’t like the results having to run your laptop and bridge connections through it. The MiFi device (like http://www.verizonwireless.com/b2c/store/controller?item=phoneFirst&action=viewPhoneOverviewByDevice&deviceType=Mobile%20Hotspots) would be much more appropriate and you could toss the USB device.

You can use Netgear Wireless Router which can support internet connection through 3g USB.
http://powershift.netgear.com/landing/en-us/3g_usb_modems.aspx

Yeah your current router if it is not compatible with a 3G usb device will not work look into getting a new one like the Netgear net1 posted or switching to a MiFi device.
















