I had a 3G USB dongle connected to a router with a usb connection on the back. This worked fine until I decided to upgrade to 4G. It is not in my area but I was going to save 10 dollars a month. I receieved the USB551L, and when I got home I plugged it in to my router and it failed to work. After studying I found a router that did say it was compatible, it is a sapido GR-1733. I am still unable to get the USB modem to work, unless I connect directly to the computer, then only allowing one computer internet access at a time. Any suggestions?