In need

Dear IT GOds
I am wondering if there is any device which you can use that has a usb input and ethernet cable output. I have a wireless usb modem on its on network and am trying to connect it to a router so I can avoid signing up to a proper internet contract. In my house we have 3 laptops all with wi-fi capability and am tying to utilise that. If you know of a device could you please contact me

Please Resond and Give Me A Correct Answer
From
Person in Need